Year	years
1960	56.502
1961	57.434
1962	58.404
1963	59.26
1964	60.063
1965	60.95
1966	61.375
1967	61.797
1968	62.194
1969	62.644
1970	63.111
1971	63.584
1972	64.083
1973	64.62
1974	65.209
1975	65.712
1976	66.277
1977	66.811
1978	67.285
1979	67.762
1980	68.245
1981	68.852
1982	69.24
1983	69.567
1984	69.937
1985	70.318
1986	70.458
1987	70.666
1988	70.896
1989	71.117
1990	71.307
1991	71.442
1992	71.526
1993	71.826
1994	72.163
1995	72.384
1996	72.327
1997	72.284
1998	72.168
1999	72.283
2000	72.775
2001	73.344
2002	73.563
2003	73.796
2004	73.898
2005	74.096
2006	74.164
2007	74.211
2008	74.25
2009	74.227
2010	74.442
2011	74.746
2012	74.944
2013	75.035
2014	75.146
2015	75.094
2016	75.289
2017	75.476
2018	75.644
2019	75.76
2020	75.938
2021	74.884
2022	76.26