Year	Percent
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0.5025
2000	0.5208
2001	0.5525
2002	0.5464
2003	2.5253
2004	1.9324
2005	1.8265
2006	1.7241
2007	1.0909
2008	1.634
2009	1.5244
2010	1.3812
2011	1.2853
2012	0.9592
2013	1.3245
2014	1.1834
2015	1.1385
2016	1.2821
2017	1.2478