date	Qobs
1982-01-01	463.52
1982-02-01	298.29
1982-03-01	268.29
1982-04-01	226.20
1982-05-01	231.39
1982-06-01	138.77
1982-07-01	88.75
1982-08-01	57.99
1982-09-01	46.67
1982-10-01	38.45
1982-11-01	34.85
1982-12-01	36.65
1983-01-01	78.37
1983-02-01	139.36
1983-03-01	213.45
1983-04-01	168.93
1983-05-01	100.56
1983-06-01	69.75
1983-07-01	44.40
1983-08-01	32.22
1983-09-01	24.49
1983-10-01	24.28
1983-11-01	38.31
1983-12-01	90.53
1984-01-01	128.16
1984-02-01	318.62
1984-03-01	311.61
1984-04-01	352.37
1984-05-01	229.26
1984-06-01	110.88
1984-07-01	70.83
1984-08-01	49.06
1984-09-01	35.74
1984-10-01	30.11
1984-11-01	32.20
1984-12-01	34.90
1985-01-01	70.75
1985-02-01	103.41
1985-03-01	131.74
1985-04-01	130.13
1985-05-01	84.93
1985-06-01	46.04
1985-07-01	23.07
1985-08-01	12.98
1985-09-01	10.67
1985-10-01	12.05
1985-11-01	32.71
1985-12-01	56.67
1986-01-01	220.20
1986-02-01	379.96
1986-03-01	297.06
1986-04-01	147.03
1986-05-01	104.97
1986-06-01	76.55
1986-07-01	46.20
1986-08-01	25.79
1986-09-01	20.20
1986-10-01	20.50
1986-11-01	29.81
1986-12-01	56.96
1987-01-01	389.71
1987-02-01	350.39
1987-03-01	305.16
1987-04-01	282.23
1987-05-01	168.81
1987-06-01	121.93
1987-07-01	76.54
1987-08-01	43.87
1987-09-01	30.30
1987-10-01	27.53
1987-11-01	46.65
1987-12-01	134.68
1988-01-01	119.61
1988-02-01	114.28
1988-03-01	179.84
1988-04-01	200.83
1988-05-01	126.08
1988-06-01	75.84
1988-07-01	43.56
1988-08-01	19.95
1988-09-01	14.93
1988-10-01	17.97
1988-11-01	48.78
1988-12-01	126.70
1989-01-01	112.73
1989-02-01	87.10
1989-03-01	83.37
1989-04-01	37.53
1989-05-01	21.55
1989-06-01	15.15
1989-07-01	11.06
1989-08-01	8.20
1989-09-01	9.36
1989-10-01	21.73
1989-11-01	56.53
1989-12-01	105.52
1990-01-01	138.03
1990-02-01	124.11
1990-03-01	134.81
1990-04-01	101.17
1990-05-01	105.65
1990-06-01	68.10
1990-07-01	17.12
1990-08-01	8.36
1990-09-01	8.59
1990-10-01	18.01
1990-11-01	43.90
1990-12-01	150.52
1991-01-01	118.35
1991-02-01	118.94
1991-03-01	107.85
1991-04-01	219.62
1991-05-01	159.19
1991-06-01	130.67
1991-07-01	60.97
1991-08-01	14.66
1991-09-01	13.76
1991-10-01	37.25
1991-11-01	35.02
1991-12-01	54.71
1992-01-01	60.60
1992-02-01	54.16
1992-03-01	98.08
1992-04-01	163.27
1992-05-01	101.79
1992-06-01	66.69
1992-07-01	23.58
1992-08-01	11.53
1992-09-01	9.43
1992-10-01	15.70
1992-11-01	38.60
1992-12-01	56.80
1993-01-01	66.50
1993-02-01	87.50
1993-03-01	177.00
1993-04-01	166.00
1993-05-01	126.00
1993-06-01	68.80
1993-07-01	21.20
1993-08-01	10.90
1993-09-01	14.10
1993-10-01	19.58
1993-11-01	37.01
1993-12-01	39.77
1994-01-01	52.66
1994-02-01	93.85
1994-03-01	117.04
1994-04-01	78.48
1994-05-01	35.80
1994-06-01	30.94
1994-07-01	16.64
1994-08-01	13.13
1994-09-01	14.92
1994-10-01	15.30
1994-11-01	15.18
1994-12-01	48.86
1995-01-01	138.70
1995-02-01	139.89
1995-03-01	144.90
1995-04-01	324.97
1995-05-01	169.84
1995-06-01	82.82
1995-07-01	26.01
1995-08-01	11.93
1995-09-01	20.48
1995-10-01	20.95
1995-11-01	63.96
1995-12-01	79.17
1996-01-01	96.54
1996-02-01	187.24
1996-03-01	250.29
1996-04-01	299.97
1996-05-01	160.19
1996-06-01	83.73
1996-07-01	32.37
1996-08-01	11.75
1996-09-01	21.48
1996-10-01	42.85
1996-11-01	49.04
1996-12-01	59.13
1997-01-01	107.87
1997-02-01	88.69
1997-03-01	98.95
1997-04-01	300.73
1997-05-01	205.94
1997-06-01	106.19
1997-07-01	38.68
1997-08-01	17.34
1997-09-01	35.78
1997-10-01	49.22
1997-11-01	57.19
1997-12-01	194.72
1998-01-01	212.23
1998-02-01	344.18
1998-03-01	245.45
1998-04-01	262.63
1998-05-01	216.55
1998-06-01	161.50
1998-07-01	81.57
1998-08-01	23.43
1998-09-01	13.28
1998-10-01	37.04
1998-11-01	80.19
1998-12-01	141.88
1999-01-01	137.65
1999-02-01	420.18
1999-03-01	412.55
1999-04-01	275.57
1999-05-01	139.84
1999-06-01	75.44
1999-07-01	35.25
1999-08-01	19.42
1999-09-01	24.33
1999-10-01	22.09
1999-11-01	18.86
1999-12-01	35.14
2000-01-01	58.79
2000-02-01	123.66
2000-03-01	187.16
2000-04-01	221.30
2000-05-01	194.42
2000-06-01	96.09
2000-07-01	46.89
2000-08-01	13.00
2000-09-01	19.74
2000-10-01	31.16
2000-11-01	34.53
2000-12-01	34.62
2001-01-01	33.12
2001-02-01	47.05
2001-03-01	38.32
2001-04-01	39.09
2001-05-01	42.95
2001-06-01	15.90
2001-07-01	7.63
2001-08-01	7.40
2001-09-01	7.25
2001-10-01	4.21
2001-11-01	9.86
2001-12-01	186.61
2002-01-01	374.32
2002-02-01	201.57
2002-03-01	165.55
2002-04-01	319.20
2002-05-01	168.97
2002-06-01	95.37
2002-07-01	25.46
2002-08-01	16.13
2002-09-01	24.18
2002-10-01	39.93
2002-11-01	45.48
2002-12-01	44.34
2003-01-01	63.54
2003-02-01	201.55
2003-03-01	266.65
2003-04-01	302.13
2003-05-01	217.71
2003-06-01	104.00
2003-07-01	37.12
2003-08-01	16.61
2003-09-01	16.35
2003-10-01	32.71
2003-11-01	71.76
2003-12-01	81.82
2004-01-01	165.91
2004-02-01	311.76
2004-03-01	270.61
2004-04-01	152.13
2004-05-01	114.27
2004-06-01	63.14
2004-07-01	15.04
2004-08-01	11.91
2004-09-01	12.33
2004-10-01	16.94
2004-11-01	22.09
2004-12-01	30.11
2005-01-01	54.38
2005-02-01	134.26
2005-03-01	280.23
2005-04-01	177.17
2005-05-01	106.35
2005-06-01	60.78
2005-07-01	26.36
2005-08-01	15.90
2005-09-01	16.96
2005-10-01	25.55
2005-11-01	45.86
2005-12-01	64.21
2006-01-01	93.20
2006-02-01	258.35
2006-03-01	424.06
2006-04-01	217.73
2006-05-01	121.86
2006-06-01	45.22
2006-07-01	14.88
2006-08-01	15.66
2006-09-01	25.87
2006-10-01	39.67
2006-11-01	52.94
2006-12-01	37.90
2007-01-01	33.49
2007-02-01	34.85
2007-03-01	56.83
2007-04-01	49.98
2007-05-01	22.82
2007-06-01	16.54
2007-07-01	8.90
2007-08-01	10.43
2007-09-01	9.53
2007-10-01	11.73
2007-11-01	22.41
2007-12-01	133.35
2008-01-01	61.24
2008-02-01	66.47
2008-03-01	89.49
2008-04-01	116.44
2008-05-01	57.03
2008-06-01	22.47
2008-07-01	22.60
2008-08-01	12.80
2008-09-01	12.95
2008-10-01	13.11
2008-11-01	20.20
2008-12-01	22.27
2009-01-01	96.99
2009-02-01	265.98
2009-03-01	420.90
2009-04-01	319.67
2009-05-01	152.45
2009-06-01	74.27
2009-07-01	30.78
2009-08-01	27.79
2009-09-01	42.03
2009-10-01	55.65
2009-11-01	65.69
2009-12-01	122.80
2010-01-01	201.48
2010-02-01	593.07
2010-03-01	459.06
2010-04-01	231.77
2010-05-01	127.84
2010-06-01	109.32
2010-07-01	62.18
2010-08-01	32.04
2010-09-01	44.76
2010-10-01	103.10
2010-11-01	147.13
2010-12-01	210.77
2011-01-01	250.81
2011-02-01	220.36
2011-03-01	185.87
2011-04-01	182.07
2011-05-01	136.45
2011-06-01	111.34
2011-07-01	68.87
2011-08-01	45.29
2011-09-01	48.87
2011-10-01	74.47
2011-11-01	51.07
2011-12-01	48.76
2012-01-01	NA
2012-02-01	NA
2012-03-01	335.03
2012-04-01	339.87
2012-05-01	207.23
2012-06-01	134.17
2012-07-01	66.45
2012-08-01	36.32
2012-09-01	52.71
2012-10-01	61.49
2012-11-01	54.66
2012-12-01	96.18
2013-01-01	125.91
2013-02-01	212.21
2013-03-01	230.48
2013-04-01	223.30
2013-05-01	132.31
2013-06-01	79.70
2013-07-01	47.63
2013-08-01	33.98
2013-09-01	42.24
2013-10-01	49.95
2013-11-01	57.39
2013-12-01	55.29
2014-01-01	44.04
2014-02-01	42.80
2014-03-01	43.62
2014-04-01	40.89
2014-05-01	77.31
2014-06-01	59.33
2014-07-01	30.12
2014-08-01	27.91
2014-09-01	41.57
2014-10-01	45.52
2014-11-01	54.65
2014-12-01	102.46
2015-01-01	312.87
2015-02-01	382.14
2015-03-01	316.65
2015-04-01	349.73
2015-05-01	178.03
2015-06-01	130.63
2015-07-01	76.77
2015-08-01	55.60
2015-09-01	58.29