Year	% of enrollment
1970	38.04833
1999	36.39413
2000	34.81253
2001	32.33824
2002	29.57802
2003	26.92677
2004	24.65595
2005	23.67038
2007	23.10329
2008	19.85654
2009	19.92514
2010	20.48948
2011	20.74503
2012	20.3251
2013	16.54675
2014	15.69987
2015	14.70214
2016	13.99844
2017	14.46358