Year	Percent
1993	0.29
1994	0.41
1995	0.52
1996	0.44
1997	0.38
1998	0.44
1999	0.55
2000	0.55
2001	0.66
2002	0.6
2003	0.74
2004	0.66
2005	0.73
2006	0.67
2007	0.6
2008	0.63
2009	0.6
2010	0.6
2011	0.53
2012	0.58
2013	0.95
2014	0.59
2015	0.6
2016	0.53
2017	0.47