There is probably enough new positions for 75-100 people (to account for expansion or new start ups, in a good year), and movement further up the food chain accounts for probably about 300 places for more experienced bods moving out of night freight/instructing/regional turbo props (again in a good year).
So all in all there is probably not much more requirement than 400 jobs per year available for new pilots This equates roughly to the output of 1 mid sized flying school.