Year	years
1960	52.66
1961	53.183
1962	53.71
1963	54.209
1964	54.648
1965	55.084
1966	55.473
1967	55.868
1968	56.31
1969	56.748
1970	57.171
1971	57.586
1972	58.032
1973	58.472
1974	58.881
1975	59.353
1976	59.792
1977	60.24
1978	60.72
1979	61.253
1980	61.781
1981	62.333
1982	62.856
1983	63.331
1984	63.773
1985	64.198
1986	64.64
1987	65.08
1988	65.454
1989	65.868
1990	65.985
1991	66.31
1992	66.708
1993	67.109
1994	67.568
1995	67.919
1996	68.409
1997	68.813
1998	69.189
1999	69.524
2000	69.737
2001	70.195
2002	70.41
2003	70.72
2004	71.131
2005	71.753
2006	72.037
2007	72.365
2008	72.715
2009	72.948
2010	73.182
2011	73.343
2012	73.552
2013	73.918
2014	74.306
2015	74.332
2016	74.442
2017	74.827
2018	75.109
2019	75.338
2020	74.009
2021	72.75
2022	73.425