Year	years
1960	50.33
1961	52.112
1962	53.697
1963	55.285
1964	56.778
1965	58.228
1966	59.656
1967	61.002
1968	62.31
1969	63.475
1970	64.45
1971	65.607
1972	66.373
1973	67.183
1974	67.864
1975	68.466
1976	69.118
1977	69.604
1978	69.978
1979	70.456
1980	70.826
1981	71.183
1982	71.47
1983	71.668
1984	72.012
1985	72.106
1986	72.269
1987	72.369
1988	72.444
1989	72.619
1990	72.668
1991	72.764
1992	72.953
1993	73.375
1994	73.517
1995	73.799
1996	74.355
1997	74.535
1998	74.641
1999	74.98
2000	75.496
2001	75.908
2002	76.088
2003	76.337
2004	76.56
2005	76.931
2006	77.156
2007	77.634
2008	78.084
2009	78.461
2010	78.748
2011	78.89
2012	79.081
2013	79.246
2014	79.328
2015	79.405
2016	79.557
2017	79.689
2018	79.857
2019	80.019
2020	79.174
2021	78.76
2022	79.246