As far as I know Map Maker doesn't currently offer any way to interact with the map or its underlying data other than through the graphical interface. That is to say that there is no way to import or export data in tabular format, so from the limited description that you've given us, I would be at a loss on how to accomplish what you're trying to do with Map Maker. The only Google product that rings a bell for what you're describing is the maps component of the
Google Charts API (formerly Visualizations), which allows you to use a Google Docs spreadsheet as a datasource and display regional charts for that data.