An analysis of data from 33 states obtained by Chalkbeat and The AP shows that public K-12 enrollment this fall has dropped across those states by more than 500,000 students, or 2%, since the same time last year. That is a significant shift considering that enrollment overall in those states has typically gone up by around half a percent in recent years. And the decline is only likely to become more pronounced, as several large states have yet to release information.