Year	Percent
1993	6.7
1994	5.9
1995	5.1
1996	6.1
1997	5.5
1998	6.81
1999	6.2
2000	6.5
2001	5.5
2002	4.8
2003	4.8
2004	4.5
2005	3.2
2006	4.42
2007	4.43
2008	4.52
2009	4.45
2010	4.41
2011	4.47
2012	3.73
2013	2.99
2014	2.86
2017	2.62