Year	% of total enrollment
1970	13.383
1971	13.76334
1972	14.20333
1973	14.39851
1974	12.74525
1975	13.16741
1976	13.72589
1977	14.82667
1978	14.87754
1979	15.16369
1980	15.77643
1981	15.91186
1982	16.21805
1983	16.40625
1984	16.4698
1985	16.41733
1986	17.03642
1987	17.6403
1988	16.91652
1989	16.92145
1990	16.592
1991	16.74738
1992	16.44439
1993	16.18957
1994	15.90833
1995	15.41669
1996	14.32045
1997	13.98809
1998	13.54842
1999	13.5058
2000	13.39849
2001	13.6718
2002	13.74313
2003	13.81671
2004	13.51036
2005	13.86147
2006	14.17558
2007	14.21358
2008	14.08256
2009	13.64527
2010	13.18332
2011	13.06983
2012	12.31657
2013	12.06251
2014	11.59664
2015	11.56811
2016	11.75507
2017	11.7385
2018	11.28635