Year	Percent
1980	0.887
1981	0.861
1982	0.881
1983	0.774
1984	0.78
1985	0.76
1986	0.779
1987	0.786
1988	0.801
1989	0.665
1990	0.68
1991	0.729
1992	0.694
1993	0.683
1994	0.648
1995	0.65
1996	0.625
1997	0.638
1998	0.623
1999	0.566
2000	0.56
2001	0.566
2002	0.501
2003	0.444
2004	0.499
2005	0.526
2006	0.548
2007	0.565
2008	0.578
2009	0.562
2010	0.526
2011	0.526
2012	0.539
2013	0.528
2014	0.491
2015	0.445
2016	0.358
2017	0.291
2018	0.23
2019	0.167
2020	0.145
2021	0.133
2022	0.126
2023	0.12
2024	0.114