Year	Percent
1993	2.03
1994	1.74
1995	1.46
1996	1.38
1997	1.36
1998	1.22
1999	1.47
2000	1.22
2001	1.2
2002	1.29
2003	1.35
2004	1.42
2005	1.37
2006	1.17
2007	1.1
2008	0.99
2009	0.85
2010	0.69
2011	0.76
2012	0.74
2013	0.64
2014	0.64
2015	0.59
2016	0.5