Year	years
1960	45.94
1961	46.484
1962	47.1
1963	47.609
1964	48.148
1965	48.782
1966	49.343
1967	50.053
1968	50.915
1969	51.816
1970	52.715
1971	53.773
1972	54.792
1973	55.932
1974	57.017
1975	58.068
1976	58.966
1977	59.947
1978	60.872
1979	61.697
1980	62.698
1981	63.472
1982	64.304
1983	65.053
1984	65.689
1985	66.33
1986	66.921
1987	67.4
1988	67.972
1989	68.491
1990	68.948
1991	69.366
1992	69.925
1993	70.303
1994	70.705
1995	71.011
1996	71.273
1997	71.483
1998	71.879
1999	72.136
2000	72.467
2001	72.974
2002	73.337
2003	73.628
2004	74.153
2005	74.588
2006	74.81
2007	75.046
2008	75.274
2009	75.431
2010	75.763
2011	76.234
2012	76.461
2013	76.626
2014	76.757
2015	76.918
2016	77.064
2017	77.16
2018	77.212
2019	77.304
2020	76.239
2021	76.936
2022	77.905