Year	Percent
1993	3.2
1994	5.41
1995	4.65
1996	4.28
1997	6.75
1998	6.68
1999	5.82
2000	4.85
2001	5.23
2002	4.56
2003	4.23
2004	5.46
2005	4.98
2006	4.88
2007	4.78
2008	4.22
2009	5.47
2010	4.9
2011	4.26
2012	4.04
2013	4.79
2014	5.86
2015	4.04
2016	2.37
2017	2.8