Year	Percent
1982	6.93
1983	7.76
1984	7.26
1985	6.55
1986	6.03
1987	3.78
1988	3.66
1989	3.13
1990	3.58
1991	4.72
1992	4.75
1993	4.86
1994	5.07
1995	7.75
1996	7.66
1997	5.78
1998	12.06
2000	11.87
2001	13.42
2002	18.05
2003	18.15
2004	15.05
2005	13.75
2006	12.91
2007	11.01
2008	10.38
2009	15.15
2010	14.03
2011	10.96
2012	10.91
2013	11.31
2014	10.4
2015	11.38
2016	10.98