Year	years
1960	60.916
1961	61.24
1962	61.035
1963	61.178
1964	61.037
1965	61.235
1966	61.525
1967	61.524
1968	61.317
1969	61.243
1970	61.971
1971	62.028
1972	62.361
1973	62.708
1974	62.803
1975	63.291
1976	63.367
1977	63.93
1978	64.38
1979	64.708
1980	64.826
1981	65.125
1982	65.083
1983	65.518
1984	65.44
1985	66.141
1986	66.655
1987	67.148
1988	67.711
1989	68.09
1990	68.552
1991	68.957
1992	69.095
1993	69.16
1994	70.18
1995	69.95
1996	70.123
1997	69.705
1998	70.149
1999	70.407
2000	70.583
2001	70.749
2002	70.752
2003	70.83
2004	71.53
2005	71.692
2006	72.066
2007	71.487
2008	72.276
2009	72.694
2010	72.516
2011	72.841
2012	72.939
2013	73.011
2014	73.424
2015	73.294
2016	72.933
2017	73.526
2018	73.631
2019	73.857
2020	72.546
2021	72.182
2022	72.851