Year	Percent
1974	0.62
1975	0.56
1976	0.6
1977	1.05
1978	0.95
1979	1.1
1980	1.05
1981	1.46
1982	2.33
1983	2.6
1984	2.5
1985	4.13
1986	3.12
1987	4.23
1988	2.61
1989	1.24
1990	2.03
1991	1.96
1992	1.24
1993	1.21
1994	1.12674
1995	0.9
1996	1.03392
1997	0.84867
1998	3.41063
1999	2.98535
2000	2.43368
2001	2.69
2002	1.97
2003	1.62
2004	1.62
2005	1.47
2006	1.3
2007	1.27
2008	1.3
2009	1.52
2010	0.6209
2011	0.65
2012	0.62
2013	0.5001
2014	0.585
2015	0.5887
2016	0.666