Year	Percent
1990	0.68597
1991	0.6768
1992	0.66708
1993	0.63719
1994	0.61273
1995	1.18212
1996	1.18832
1997	1.05444
1998	0.99571
1999	0.96602
2000	0.95101
2001	1.26798
2002	1.46916
2003	0.93423
2006	0.50558
2007	0.48779
2008	0.48103
2009	0.46679
2010	0.47557
2011	0.45597
2012	0.42207
2013	0.41931
2014	0.40919
2015	0.41173
2016	0.44082
2017	0.42822
2018	0.40655
2019	0.38862
2020	0.40708