Year	% of enrollment
1990	19.76013
1992	17.34791
1999	14.5864
2000	16.63704
2001	17.69047
2002	17.27146
2003	15.93387
2004	15.22622
2005	14.2162
2006	13.52083
2007	13.46714
2008	13.12363
2009	12.18208
2010	11.7942
2011	10.72104
2012	9.5911
2013	8.64109
2014	6.8323
2015	5.36038
2016	4.72462
2017	4.57838
2018	3.99417