Year	Percent
1993	0.53007
1994	0.77379
1995	0.92597
1996	0.90669
1997	0.90277
1998	0.62486
1999	0.5113
2000	0.39514
2001	0.40259
2002	0.41985
2003	0.41638
2004	0.36098
2005	0.40023
2006	0.48263
2007	0.51619
2008	0.60854
2009	0.45789
2010	0.3155
2011	0.32739
2012	0.32767
2013	0.33449
2014	0.34529
2015	0.35394
2016	0.44
2017	0.42068