Year	Percent
1982	32.6092
1983	33.28105
1984	28.37795
1985	51.96685
1986	77.19588
1987	69.77922
1988	61.02516
1989	54.22965
1990	32.29885
1991	68.63881
1992	36.86079
1993	14.74339
1994	19.78619
1995	52.41298
1996	38.89044
1997	15.33591
2001	7.09981
2002	5.95153
2003	10.81643
2004	11.70833
2005	6.69022
2006	12.61887
2007	7.49481
2008	5.66242
2009	6.23557
2010	9.50753
2011	1.71633
2012	4.42114
2013	0.76205
2014	0.72112
2015	0.71906