Missed the point
The statistics are roughly equivalent to the pool we're drawing recruits from.
Maybe the real discussion should be about government-controlled education.
As far as history goes, you can see the long-range trends here.
Might be fun to chart these numbers over presidential administrations.
There's no real crisis here, and in fact, recruitment is doing better than you would expect during a time of active combat.
Mostly it's Waxman making waves, which is pretty much his full-time job on that committee right now.