Year	Percent
1984	0.98
1986	3.79
1987	1.15
1989	1.19
1991	1.12
1992	0.93
1993	1.38
1994	0.82
1995	0.47
1996	1.54
1997	1.59
1998	0.83
1999	4.24
2001	1.4
2002	3.74
2003	2.86
2004	3.37
2006	3.69
2007	2.71
2008	3.26
2009	4.67
2010	2.92
2011	3.01
2012	4.38
2013	3.7
2014	3.37
2015	4.16
2016	3.87