Year	% of total enrollment
1970	19.71927
1971	19.6703
1972	18.6832
1973	17.73927
1974	16.76487
1975	15.91443
1976	15.04697
1977	13.9641
1978	13.15205
1979	12.36282
1980	11.44901
1981	10.54172
1982	9.62659
1983	8.65331
1984	7.6588
1985	6.6631
1986	5.69187
1987	4.76434
1988	4.81038
1989	4.69564
1990	4.75052
1991	4.75324
1992	4.6919
1993	4.60594
1994	4.53927
1995	4.47186
1996	4.52256
1997	4.58019
1998	4.6518
1999	4.67443
2000	4.8459
2001	4.43272
2002	4.40733
2003	4.34591
2004	4.4797
2005	4.61901
2006	4.56297
2007	4.87562
2008	4.80855
2009	5.17097
2010	5.46281
2011	5.51213
2012	3.56547
2013	3.00725
2014	2.26549
2015	1.69623
2016	1.45763
2017	1.38304
2018	1.29332