A lot? Not so much.
I've made a screenshot of this exactly 5 days ago.
It was staked: 4433860 LEO
Today: 4227683
Which is down 206K, or only -4.65 %
The new added segment POOL (on the diag above) make the reduction look larger than it really is
Keep in mind that reward pool went down -15% by itself, from 85% of daily new Leo's to 70%