Year	% of total enrollment
1970	3.65907
1971	3.59055
1972	3.47444
1973	3.39834
1974	3.25384
1975	3.07008
1976	2.8715
1977	2.91632
1978	2.87932
1979	2.81003
1980	2.75335
1981	2.67653
1982	2.67961
1983	2.6482
1984	2.55845
1985	2.52964
1986	2.48213
1987	2.49643
1988	2.33777
1989	2.26588
1990	2.18739
1991	2.15147
1992	2.06666
1993	2.03092
1994	1.99311
1995	1.97334
1996	1.95639
1997	1.92163
1998	1.90297
1999	1.88282
2000	1.85056
2001	1.81034
2002	1.77661
2003	1.73504
2004	1.71325
2005	1.72052
2006	1.66769
2007	1.62454
2008	1.67041
2009	1.61104
2010	1.58293
2011	1.56616
2012	1.51793
2013	1.52375
2014	1.48877
2015	1.47665
2016	1.49347
2017	1.46568
2018	1.42089