Year	Percent
1990	2.10963
1991	1.46325
1992	1.06518
1993	1.03462
1994	0.93564
1995	0.77594
1996	1.05796
1997	1.02016
1998	0.9849
1999	0.89833
2000	0.8714
2001	0.84629
2002	0.71986
2003	0.70023
2004	0.68139
2005	0.66266
2006	0.64382
2007	0.62534
2008	0.52056
2009	0.50561
2010	0.49126
2011	0.47755
2012	0.46457
2013	0.45234
2014	0.44076
2015	0.43095
2016	0.42163
2017	0.41266
2018	0.40616
2019	0.40001
2020	0.39964