Even without training specific to Ada 95, Ada 83 programmers already
should understand the concepts of packages and private types, tasks,
exceptions, generics, etc.  I suspect that for software written for
satellites, these are still the most important features of Ada.
So I would talk in terms of number of Ada programmers, not "Ada 95"
programmers.  Certainly many "C++" programmers are really just C
programmers who take advantage of incremental C++ improvements, without
necessarily being full OO specialists.