Year	Percent
1980	0.565
1981	0.588
1982	0.618
1983	0.636
1984	0.644
1985	0.651
1986	0.664
1987	0.7
1988	0.759
1989	0.821
1990	0.88
1991	0.932
1992	0.914
1993	0.975
1994	1.022
1995	1.066
1996	1.085
1997	1.014
1998	0.912
1999	0.922
2000	0.919
2001	0.928
2002	0.957
2003	0.986
2004	0.996
2005	0.99
2006	0.986
2007	0.986
2008	0.975
2009	0.972
2010	0.993
2011	0.962
2012	1
2013	0.993
2014	0.969
2015	0.967
2016	0.968
2017	0.971
2018	0.977
2019	0.979
2020	0.979
2021	0.978
2022	0.977
2023	0.977
2024	0.978