Year	years
1960	53.186
1961	53.978
1962	54.732
1963	55.438
1964	56.067
1965	56.609
1966	57.077
1967	57.492
1968	57.864
1969	58.22
1970	58.575
1971	58.934
1972	59.272
1973	59.571
1974	59.816
1975	59.991
1976	60.117
1977	60.245
1978	60.425
1979	60.716
1980	61.166
1981	61.767
1982	62.454
1983	63.177
1984	63.874
1985	64.495
1986	65.026
1987	65.485
1988	65.877
1989	66.221
1990	66.533
1991	66.826
1992	67.112
1993	67.43
1994	67.781
1995	68.201
1996	68.674
1997	69.194
1998	69.717
1999	70.227
2000	70.692
2001	71.098
2002	71.422
2003	71.653
2004	71.781
2005	71.782
2006	71.697
2007	71.54
2008	71.376
2009	71.273
2010	71.295
2011	71.451
2012	71.651
2013	71.814
2014	71.859
2015	71.723
2016	71.398
2017	71.044
2018	70.829
2019	70.931
2020	66.334
2021	66.056
2022	71.547