Year	Percent
1984	1.95
1985	3.4
1986	5.86
1987	4.21
1988	2.96
1989	1.87
1991	1.88
1992	2.42
1993	2.32
1994	2.26
1995	2.81
1996	2.78
1997	2.08
1998	2.86
1999	4.24
2001	3.35
2002	5.08
2003	5.64
2004	5.36
2006	3.94
2007	3.33
2008	3.41
2009	5.12
2010	3.58
2011	3.34
2012	3.11
2013	3.35
2014	3.32
2015	3.09
2016	3.6