Year	years
1960	65.673
1961	65.954
1962	65.989
1963	66.809
1964	66.981
1965	67.409
1966	67.909
1967	68.092
1968	68.063
1969	68.213
1970	68.635
1971	68.73
1972	69.011
1973	69.445
1974	69.667
1975	69.837
1976	70.007
1977	69.917
1978	70.081
1979	70.215
1980	70.686
1981	71.04
1982	71.369
1983	71.207
1984	71.45
1985	71.609
1986	71.799
1987	72.141
1988	72.427
1989	73.184
1990	73.359
1991	73.364
1992	73.287
1993	73.041
1994	72.963
1995	72.837
1996	73.025
1997	72.764
1998	72.716
1999	72.807
2000	72.816
2001	72.758
2002	73.168
2003	73.261
2004	73.581
2005	73.735
2006	73.797
2007	73.684
2008	73.604
2009	74.139
2010	74.667
2011	74.997
2012	74.819
2013	74.555
2014	74.21
2015	73.971
2016	73.917
2017	73.912
2018	73.903
2019	73.874
2020	73.918
2021	72.543
2022	72.737