Year	Percent
1990	0.54829
1991	0.50646
1992	0.46866
1993	0.46275
1994	0.45586
1995	1.65478
1996	1.63061
1997	1.25024
1998	1.1915
1999	0.43086
2000	0.38689
2001	0.35458
2002	0.31105
2003	0.28313
2004	0.27449
2005	0.27486
2006	0.49762
2007	0.29497
2008	0.29056
2009	0.36586
2010	0.38594
2011	0.36846
2012	0.29175
2013	0.35588
2014	0.37418
2015	0.35531
2016	0.34742
2017	0.33647
2018	0.37713
2019	0.37278
2020	0.3883