Vertically align the bars to the bottom

[Zach Bauhaus]

I have a chart with a set height, and a selector that changes the chart data depending on the term selected in the dropdown. Each term selected has a unique number of bars, so in some cases when there are only 1 or a few bars, they space out evenly vertically. I would like for them to not space out, but position themselves to the bottom, so they don't look so odd compared to the ones with 30+ bars. Is this possible?

Thank you.