Year	Percent
1985	44.24729
1986	47.25984
1987	41.34462
1988	38.11325
1989	32.76359
1990	29.76504
1991	28.57143
1992	50
1993	50.68027
1994	69.3703
2000	62.86128
2001	74.94685
2002	56.66896
2003	62.02893
2004	54.14485
2005	53.6388
2006	38.97826
2007	43.51562
2008	51.22655
2009	55.40868
2010	42.92122
2011	42.16296
2012	40.23421
2013	39.37987
2014	42.2456
2015	36.87845
2016	29.41717
2017	27.65083