Year	Percent
1990	1.25077
1991	0.57793
1992	0.55677
1993	0.53977
1994	0.52331
1995	0.50461
1996	0.48685
1997	0.47046
1998	0.45513
1999	1.19403
2000	1.24997
2001	0.86463
2002	0.83369
2003	0.51671
2004	0.55806
2005	0.54087
2007	0.38225
2008	0.36982
2009	0.35758
2010	0.34534
2011	0.33316
2012	0.32129
2013	0.31004
2014	0.29942
2015	0.2893
2016	0.27947
2017	0.27004
2018	0.26127
2019	0.25305
2020	0.24723