Year	Percent
1990	0.94952
1991	1.37356
1992	1.83298
1993	1.83302
1994	1.68826
1995	1.37714
1996	1.30152
1997	1.38684
1998	1.31265
1999	1.09198
2000	0.93342
2001	0.95096
2002	0.88242
2003	0.82823
2004	0.74225
2005	0.64328
2006	0.64016
2007	0.59636
2008	0.55756
2009	0.73613
2010	0.79883
2011	0.81452
2012	0.81368
2013	0.88828
2014	1.0836
2015	1.07722
2016	1.07749
2017	1.03506