Year	years
1960	51.035
1961	52.364
1962	52.79
1963	53.244
1964	53.978
1965	54.712
1966	55.254
1967	55.754
1968	56.207
1969	56.932
1970	57.711
1971	58.524
1972	59.051
1973	59.836
1974	60.552
1975	61.272
1976	61.978
1977	62.354
1978	62.74
1979	63.209
1980	64.012
1981	64.595
1982	65.163
1983	65.789
1984	66.733
1985	67.587
1986	68.419
1987	69.448
1988	69.689
1989	70.122
1990	70.445
1991	70.717
1992	70.885
1993	71.068
1994	71.227
1995	70.948
1996	71.653
1997	72.501
1998	72.862
1999	72.542
2000	72.316
2001	72.613
2002	72.93
2003	73.155
2004	73.08
2005	73.82
2006	74.938
2007	75.187
2008	75.492
2009	75.842
2010	76.131
2011	76.421
2012	76.772
2013	77.083
2014	77.415
2015	77.717
2016	78.049
2017	78.394
2018	78.662
2019	78.975
2020	79.274
2021	78.715
2022	79.68