Year	years
1960	60.423
1961	60.755
1962	61.058
1963	61.334
1964	61.583
1965	61.819
1966	61.988
1967	62.153
1968	62.319
1969	62.499
1970	62.684
1971	62.803
1972	62.935
1973	63.066
1974	63.233
1975	63.445
1976	63.705
1977	63.941
1978	64.132
1979	64.448
1980	64.749
1981	65.023
1982	65.385
1983	65.614
1984	65.966
1985	66.315
1986	66.656
1987	67.012
1988	67.319
1989	67.469
1990	67.944
1991	68.173
1992	68.395
1993	68.633
1994	68.824
1995	69.009
1996	69.202
1997	69.325
1998	69.478
1999	69.634
2000	69.75
2001	69.9
2002	70.025
2003	70.297
2004	70.481
2005	70.527
2006	70.781
2007	71.106
2008	71.384
2009	71.635
2010	71.887
2011	72.131
2012	72.454
2013	72.757
2014	72.878
2015	73.191
2016	73.534
2017	73.644
2018	73.568
2019	73.621
2020	73.182
2021	70.262
2022	70.475