Year	Percent
1985	2.16
1986	1.97
1987	0.65
1988	0.21
1989	0.21
1990	0.43
1991	0.88
1992	0.71
1993	1.25
1994	0.52
1995	1.5
1996	0.53
1997	0.57
1998	1.15
2002	3.78
2003	2.59
2004	3.34
2005	1.63
2009	1.35
2011	1.14
2012	0.79
2013	1.49
2014	2.77
2015	2.02
2016	1.85