Year	Percent
1980	1.019
1981	1.056
1982	1.048
1983	1.003
1984	1.01
1985	0.964
1986	0.931
1987	0.915
1988	0.913
1989	0.901
1990	0.863
1991	0.835
1992	0.733
1993	0.728
1994	0.73
1995	0.726
1996	0.73
1997	0.719
1998	0.704
1999	0.697
2000	0.693
2001	0.695
2002	0.7
2003	0.692
2004	0.688
2005	0.691
2006	0.693
2007	0.692
2008	0.694
2009	0.686
2010	0.672
2011	0.666
2012	0.66
2013	0.655
2014	0.644
2015	0.631
2016	0.613
2017	0.6
2018	0.584
2019	0.572
2020	0.561
2021	0.551
2022	0.542
2023	0.533
2024	0.523