Year	Percent
1993	4.56
1994	7.56
1995	6.6
1996	5.6
1997	8.85
1998	8.37
1999	7.44
2000	6.61
2001	6.94
2002	6.13
2003	5.69
2004	6.89
2005	6.85
2006	7.11
2007	6.68
2008	5.42
2009	6.91
2010	6.18
2011	5.33
2012	5.14
2013	6.05
2014	8.01
2015	5.44
2016	3.05
2017	3.47