Year	Percent
1984	0.88
1986	2.27
1987	2.49
1989	2.52
1991	2.7
1992	2.44
1994	2.04
1996	0.47
1997	1.67
1999	4.76
2001	1.45
2002	4.48
2003	1.28
2004	3.66
2006	3.38
2007	2.76
2008	2.48
2009	3.91
2010	2.55
2011	1.62
2012	4
2013	2.92
2014	3.07
2015	3.52
2016	3.43