Year	% of enrollment
1970	0.62728
1998	0.16137
1999	0.02342
2000	0.26686
2001	0.26574
2002	0.00499
2003	0
2004	0
2005	0.39912
2006	0.3755
2007	0.1133
2008	0.21699
2009	0.3577
2010	0.09503
2011	0.17006
2012	0.33321
2013	0.4092
2014	0.39473
2015	0.24554
2016	0.24776
2017	0.24278