IDK, but it might be roughly equivalent in ratio to the number of births per month nationwide. I’ve excerpted a chart from the CDC National Vital Statistics Reports, Vol. 67, No. 1, January 31, 2018, with data from 2016. You can find the full report here: bit.ly/CDC-births, where you might want to find the reports with data from 1996-2000, for a more precise calibration with the current age of students. Happy Belated Birthday!