Year	Percent
1990	1.47233
1991	1.43057
1992	1.40832
1993	1.38743
1994	1.37033
1995	1.28734
1996	1.3341
1997	1.28316
1998	1.23839
1999	1.22648
2000	1.36092
2001	1.32961
2002	1.3152
2003	1.30443
2004	1.26142
2005	1.23525
2006	1.22109
2007	1.19355
2008	1.17976
2009	1.23506
2010	1.21139
2011	1.17645
2012	1.13822
2013	1.08358
2014	1.03633
2015	1.00042
2016	0.95672
2017	0.85556
2018	0.69875
2019	0.75309
2020	0.72536