Year	% of enrollment
1970	19.87451
1971	19.29869
1972	19.21162
1973	19.83806
1974	20.06137
1975	19.09567
1976	19.7488
1977	19.96829
1978	20.11498
1980	21.37168
1982	21.22673
1983	21.92652
1984	19.81333
1985	18.0363
1986	16.81726
1987	15.84753
1988	15.92647
1989	15.33767
1990	15.12367
1991	15.66913
1992	14.45286
1993	15.88567
1994	16.71014
1995	16.71373
1996	15.78197
1999	13.96027
2000	11.89749
2001	11.41613
2002	11.75742
2004	12.1771
2005	12.08183
2006	21.78604
2007	21.65412
2008	20.73509
2010	20.57256