Year	Percent
1975	0.54019
1976	0.54509
1977	0.48516
1978	0.62907
1979	0.54722
1980	0.4906
1981	0.54831
1982	0.64037
1983	0.7306
1984	0.84247
1985	0.92583
1986	1.18452
1987	1.14323
1988	1.19774
1989	1.19303
1990	1.05843
1991	1.29777
1992	1.37862
1993	1.4809
1994	1.83043
1995	1.78707
1996	1.79243
1997	2.00402
1998	2.18089
1999	2.33325
2000	2.26265
2001	2.2382
2002	2.20332
2003	1.92768
2004	1.66536
2005	1.39541
2006	1.09424
2007	0.97667
2008	0.82731
2009	1.03689
2010	0.73503
2011	0.65142
2012	0.62794
2013	0.63317
2014	0.62872
2015	0.72367
2016	0.75086
2017	0.76176
2018	0.71146
2019	0.74671
2020	0.96389
2021	0.94342
2022	0.82374