Year	Percent
1990	1.30921
1991	1.26929
1992	1.3302
1993	1.29847
1994	1.26385
1995	1.24308
1996	1.21537
1997	1.17295
1998	1.10982
1999	1.10922
2000	1.11775
2001	1.11862
2002	1.08172
2003	1.04587
2004	0.76489
2005	0.76849
2006	0.89811
2007	0.90809
2008	0.89004
2009	0.91337
2010	0.91197
2011	0.90502
2012	0.86891
2013	0.86018
2014	0.57839
2015	0.53983
2016	0.51246
2017	0.50055
2018	0.50139
2019	0.50075
2020	0.54059