I created a spreadsheet with all the ICv2 rankings going back to 2004, and then output it into a chart. This is what that looks like. You can click on the image to enlarge it.
And this is a (reverse) total of the rankings over the last 15 years for each RPG listed. Higher is better:
And this is a (reverse) total of the rankings over the last 15 years for each RPG listed. Higher is better: