Year	Percent
1992	0.34338
1993	0.56336
1994	0.64332
1995	0.59945
1996	0.56641
1997	0.64162
1998	0.6878
1999	0.51305
2000	0.35844
2001	0.26317
2002	0.66445
2003	0.56079
2004	1.16054
2005	1.06631
2006	1.13394
2007	0.80298
2008	1.18835
2009	1.26136
2010	0.92804
2011	1.19757
2012	1.18576
2013	1.27798
2014	1.12939
2015	1.61591
2016	1.54208
2017	1.17417