Year	years
1960	60.582
1961	60.88
1962	61.023
1963	61.372
1964	61.522
1965	61.686
1966	62.329
1967	62.702
1968	62.966
1969	63.335
1970	63.715
1971	64.073
1972	64.516
1973	64.868
1974	65.259
1975	65.428
1976	65.807
1977	66.14
1978	66.491
1979	66.908
1980	67.372
1981	68.178
1982	68.456
1983	68.587
1984	68.751
1985	68.861
1986	68.954
1987	69.581
1988	70.082
1989	70.039
1990	70.096
1991	70.142
1992	70.177
1993	70.223
1994	70.27
1995	70.311
1996	70.447
1997	70.491
1998	70.54
1999	70.591
2000	70.597
2001	70.724
2002	70.817
2003	70.91
2004	70.63
2005	70.965
2006	71.384
2007	71.797
2008	71.256
2009	71.644
2010	72.126
2011	72.223
2012	72.346
2013	72.361
2014	72.448
2015	72.569
2016	72.582
2017	72.838
2018	73.096
2019	73.286
2020	72.828
2021	71.798
2022	72.145