Year	Percent
1982	2.76
1983	3.62
1984	3.32
1985	3.78
1986	2.8
1987	1.47
1988	0.97
1989	0.78
1990	0.92
1991	1.42
1992	1.7
1993	1.86
1994	1.91
1995	3.24
1996	2.63
1997	1.92
1998	4.53
2000	6.28
2001	5.44
2002	8.89
2003	10.02
2004	9.82
2005	7.37
2006	5.9
2007	4.58
2008	3.97
2009	5.53
2010	4.62
2011	3.38
2012	3.15
2013	3.31
2014	3.39
2015	3.03
2016	2.99