Year	Percent
1985	1.46
1986	1.32
1987	0.94
1988	0.79
1989	0.64
1990	0.76
1991	1.08
1992	1.39
1993	1.42
1994	1.22
1995	2.32
1996	1.76
1997	1.59
1998	3.05
2000	3.07
2001	3.01
2002	5.02
2003	5.43
2004	4.98
2005	3.83
2006	3.07
2007	2.8
2008	2.52
2009	3.66
2010	2.81
2011	2.34
2012	2.33
2013	2.47
2014	2.51
2015	2.6
2016	2.6