Carter is a new high school with this being their first year to write letters. South Oak Cliff, Sunset, and Pinkston have been writing letters for several years.
This chart seems to indicate very strong progress for Sunset and SOC in gaining student enrollment stability. It also shows great progress at Carter but no letters were written there last year. Now to see what happens this year as 4 times as many students write letters, and also write to their parents and other relatives at all 4 schools.