Back in 1960, 28.7% of the total NRA membership maintained skill Classifications in competition and there were almost as many Qualification awards recognized as total members (89.5%)

Today, only 2% of the total NRA membership maintained skill Classifications in competition and 0.2% participate in the Qualification program.

Despite a ten-fold increase in membership, less NRA members hold a Classification today than did in the 1960s. Part of the reason for less organized shooting activity in public schools is gun owners are less interested in participating in organized shooting activity.

Some stats:

https://firearmusernetwork.com/nra-classification-fall-off/

https://firearmusernetwork.com/history-of-the-marksmanship-qualification-program/

https://www.scribd.com/doc/192788709/NRA-Competitions-Division-stats-1961