Year	Percent
1980	0
1981	0
1982	0
1983	0.322
1984	0
1985	0
1986	0
1987	0.217
1988	0.215
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0.27
1997	0.245
1998	1.055
1999	0.93
2000	0.2
2001	0.2
2002	0.4
2003	0.2
2004	0.3
2005	0.4
2006	0.3
2007	0.3
2008	0.3
2009	0.7
2010	2.1
2011	2
2012	1.8
2013	1.3
2014	1.8
2015	2.1
2016	2
2017	2.4