Year	years
1960	57.13
1961	57.73
1962	58.301
1963	58.892
1964	59.375
1965	59.815
1966	60.204
1967	60.531
1968	60.871
1969	61.216
1970	61.569
1971	62.051
1972	62.569
1973	63.06
1974	63.64
1975	64.27
1976	64.845
1977	65.424
1978	65.954
1979	66.38
1980	66.868
1981	67.197
1982	67.531
1983	67.745
1984	67.979
1985	66.276
1986	68.26
1987	68.268
1988	68.391
1989	68.533
1990	68.644
1991	68.813
1992	69.038
1993	69.342
1994	69.613
1995	69.933
1996	70.189
1997	70.492
1998	70.738
1999	70.926
2000	71.32
2001	71.502
2002	71.939
2003	72.361
2004	72.695
2005	73.081
2006	73.468
2007	73.837
2008	74.295
2009	74.742
2010	75.033
2011	75.32
2012	75.597
2013	75.827
2014	76.043
2015	76.257
2016	76.471
2017	76.646
2018	76.748
2019	76.752
2020	74.769
2021	72.83
2022	73.659