Year % of enrollment 1975 23.10439 1977 25.15913 1988 26.39209 1996 20.99704 1997 18.74582 1998 17.85854 1999 17.04567 2000 17.85425 2001 18.86583 2002 18.14536 2003 18.14546 2011 27.00437 2013 8.75717 2015 12.08006 2016 13.89029