Year	Percent
1982	4.91
1983	5.67
1984	5.92
1985	5.29
1986	5.41
1987	3.93
1988	3.09
1989	2.38
1990	3.26
1991	3.65
1992	3.88
1993	4.11
1994	3.58
1995	5.93
1996	5.58
1997	4.6
1998	9.01
2000	10.4
2001	9.2
2002	11.92
2003	11.68
2004	9.2
2005	7.91
2006	8.09
2007	7.18
2008	6.86
2009	10.13
2010	10.37
2011	7.72
2012	7.65
2013	7.73
2014	8.12
2015	9.57
2016	8.6