I was looking at different categories of in the Census Bureau's "American FactFinder" (good stuff for research purposes!) and came across surprising data on the number of students in grades 9-12 from 2005 through 2014 (only years available).
I created some bar charts. Becareful in reading the vertical (Y-axis). They do not start at 0 but at the lowest millionth that the category falls under. Perhaps not good technique, but...
The vertical axis (left hand scale) starts at 16,000,000. Notice the rise in 2006 then a steady fall until we get back where we started (the actual numbers or on the horizontal axis below the corresponding year. I put the actual enrollment numbers along the bottom of the horizontal axis for reference.
Starting in 2012 the number flatlines. No growth in the secondary students in 10 years.
How about the younger grades?
No growth there either. Pretty flat from 2010 on.
Now we are getting somewhere. Grades 1-4 show a growth from 2005 to 2014 of 849,262 or 5.46%
Kindergarten has 236,792 or 5.97% more little ones.
Total enrollment K-12 increased 1,088,579 or 2.05%.