Year	Percent
1985	44.24729
1986	47.25984
1987	41.34462
1988	38.11325
1989	32.76359
1990	29.76504
1991	28.57143
1992	47.36842
1993	49.31973
2000	89.68583
2001	75.38894
2002	68.29095
2003	68.42474
2004	70.2503
2005	86.01863
2006	79.79625
2007	73.95818
2008	76.31842
2009	54.90769
2010	62.34599
2011	65.35271
2012	63.08923
2013	55.68875
2014	48.01637
2015	33.44838
2016	30.01704
2017	29.93561