Year	% of total enrollment
1970	14.79094
1971	14.76302
1972	14.32421
1973	13.82394
1974	13.25286
1975	12.76819
1976	12.21226
1977	11.66969
1978	11.6124
1979	11.09702
1980	10.61874
1981	9.98633
1982	9.47409
1983	9.0222
1984	8.4276
1985	7.87006
1986	7.46867
1987	6.96363
1988	6.8179
1989	6.73439
1990	6.76313
1991	6.73177
1992	6.62007
1993	6.40636
1994	6.18505
1995	6.0583
1996	5.89346
1997	5.72961
1998	5.71284
1999	5.78891
2000	5.85657
2001	5.60485
2002	5.42683
2003	4.97406
2004	4.91895
2005	5.0031
2006	4.8581
2007	4.89724
2008	4.75542
2009	4.98805
2010	5.07767
2011	5.07815
2012	3.98847
2013	3.48097
2014	2.98698
2015	2.55206
2016	2.3845
2017	2.37066
2018	2.28119