Year	% of enrollment
1972	22.51962
1999	22.66931
2000	24.01862
2002	21.75992
2003	21.24188
2004	21.33155
2005	20.65362
2006	17.98534
2007	19.28927
2008	20.57341
2009	11.28246
2010	14.21989
2011	14.43987
2012	14.36321
2013	15.31266
2014	15.58122
2015	14.53714
2016	13.87557
2017	12.51087
2018	11.10799