Year	Percent
1961	23.61368
1962	23.33641
1963	24.122
1964	24.26063
1965	23.75231
1966	24.26063
1967	24.26063
1968	24.07579
1969	24.16821
1970	24.26063
1971	24.35305
1972	24.35305
1973	24.81516
1974	25.18484
1975	24.95379
1976	24.49168
1977	24.53789
1978	24.63031
1979	24.63031
1980	24.63031
1981	24.86137
1982	24.95379
1983	25.55453
1984	26.06285
1985	26.57116
1986	26.75601
1987	26.66359
1988	26.61738
1989	26.57116
1990	26.75601
1991	26.7098
1992	26.66359
1993	26.66359
1994	26.75601
1995	26.47874
1996	26.06285
1997	26.01664
1998	25.97043
1999	25.83179
2000	26.15527
2001	25.92421
2002	26.01664
2003	25.46211
2004	23.72921
2005	23.77542
2006	23.51201
2007	23.94177
2008	23.82625
2009	24.14972
2010	23.31331
2011	23.89094
2012	24.31608
2013	24.04344
2014	24.8475
2015	24.6719
2016	25.50832
2017	29.7597
2018	29.63494
2019	29.50092
2020	29.87061
2021	29.7366