Year	% of enrollment
1971	21.90528
1972	17.72624
1973	19.12403
1977	29.14296
1978	29.07483
1981	20.23934
1982	19.62162
1983	18.35665
1986	19.08925
1987	21.79671
1988	26.1223
1989	25.88946
1990	17.89805
1991	18.10875
2005	24.26688
2006	23.4709
2007	20.97882
2008	20.35225
2009	21.45278
2010	22.15347
2011	21.36774
2012	21.01169