Here is a video about FIRST impact on STEM degree production.
I have researched high school grads who go into engineering. I usually say the average high school in the U.S. Sends two into engineering and only one will actually graduate with an engineering degree. Pretty much what you report.
FIRSTers are greatly increasing the number of those entering engineering an a high percentage graduate with an engineering degree. But this info is only local from a few high schools and limited to those who go to Arizona State University.
I wish states would track and report where engineering students went to high school and graduate with engineering degrees. I know our club is responsible for a lot of women and Latino engineers. A metric that is not even noted, yet perhaps more important than the scores that are collected and used to judge the value of a high school.
Keep up the good work.