Year	Percent
1985	2.62
1986	2.24
1987	1.28
1988	0.92
1989	0.71
1990	0.96
1991	1.52
1992	1.59
1993	1.52
1994	1.59
1995	2.79
1996	2.55
1997	1.89
1998	4.11
2000	4.75
2001	5.2
2002	7.16
2003	8.07
2004	6.58
2005	5.64
2006	4.83
2007	3.85
2008	3.43
2009	5.26
2010	4.27
2011	3.44
2012	3.23
2013	3.16
2014	2.88
2015	2.71
2016	3.17