12 Sources, please?
I googled "membership in the Boy Scouts of America numbers graph" to get the other. It's the fourth image.
I can't absolutely vouch for the data and couldn't get to the page the second graph came from and don't have a chart for the most recent years, but my understanding is the membership in the BSA was in decline for a long time. The small rally around 1998-1999 was a surprise though.