Year	Percent
1961	20.89552
1962	20.89552
1963	19.40299
1964	19.40299
1965	19.40299
1966	19.40299
1967	19.40299
1968	17.91045
1969	17.91045
1970	17.91045
1971	14.92537
1972	16.41791
1973	16.41791
1974	13.43284
1975	11.9403
1976	11.9403
1977	11.9403
1978	11.9403
1979	11.9403
1980	11.9403
1981	10.44776
1982	8.95522
1983	8.95522
1984	8.95522
1985	7.46269
1986	5.97015
1987	4.47761
1988	4.47761
1989	2.98507
1990	2.98507
1991	1.79104
1992	1.79104
1993	1.79104
1994	1.79104
1995	1.79104
1996	1.79104
1997	1.79104
1998	1.79104
1999	1.79104
2000	1.79104
2001	1.79104
2002	1.77778
2003	1.16448
2004	1.1611
2005	1.10305
2006	1.08069
2007	1.15108
2008	1
2009	1
2010	1.05413
2011	1.03693
2012	1.03399
2013	0.94767
2014	0.93089
2015	0.93089
2016	0.93089
2017	0.92697
2018	0.92437
2019	0.92179
2020	0.91922
2021	0.91922