I decided to make a chart to see if Graduations/Additions of certain members actually had an impact on sales, or if there was a trend at all. Here are my findings.
(I made a second graph from 2007-2011 since that’s when sales became hard to read in the grand scheme of things on the regular chart.)
Note: Red lines are where a graduation happens, and a green line is where a member addition happens
Also: The dates are not even because these are the months of singles released, and the intervals between single releases hasn’t always been even.