go back 17 years from 2007 in Illinois and there were (rounded to the nearest thousand) 198,000 live births to Illinois residents. That would make those kids juniors or seniors in 2007. 17 years ago in Illinois there were (rounded to the nearest thousand) 180,000 live births to Illinois residents. That is a difference of 18,000 kids. The numbers you provided show a drop of 14,000 kids. It looks like as a percentage of available kids there has been an increase of Illinois kids playing football.