Year	Percent
1992	0.35826
1993	0.55039
1994	0.79454
1995	0.56595
1996	0.60418
1997	0.63789
1998	0.62816
1999	0.53814
2000	0.36849
2001	0.34737
2002	0.53411
2003	0.66175
2004	1.00984
2005	1.01597
2006	1.04468
2007	0.89469
2008	1.08986
2009	1.15064
2010	0.8971
2011	1.17589
2012	1.2166
2013	1.32598
2014	1.29891
2015	1.61058
2016	1.67849
2017	1.356