Year	Percent
1985	42.21106
1986	40.13491
1987	42.74194
1988	39.24419
1989	36.23188
1990	37.58573
1991	36.39053
1992	49.6136
1993	41.92148
1994	32.6411
1995	37.56195
1996	29.1688
1997	25.91638
1998	24.95578
1999	27.46092
2000	35.27613
2001	36.1844
2002	35.14078
2003	33.14137
2004	30.91679
2005	27.36667
2006	27.36402
2007	26.42848
2008	24.55753
2009	24.50881
2010	24.97663
2011	22.46875
2012	22.04263
2013	22.957
2014	22.30184
2015	24.39382
2016	27.23921