Year	years
1960	57.015
1961	57.537
1962	57.771
1963	57.15
1964	58.738
1965	59.455
1966	59.689
1967	60.72
1968	61.63
1969	61.905
1970	62.491
1971	62.732
1972	62.281
1973	63.905
1974	64.901
1975	66.279
1976	65.855
1977	67.402
1978	68.074
1979	68.186
1980	68.84
1981	69.909
1982	70.299
1983	70.011
1984	70.46
1985	71.176
1986	71.81
1987	72.54
1988	72.456
1989	72.467
1990	72.574
1991	73.574
1992	74.135
1993	74.195
1994	74.614
1995	74.609
1996	74.899
1997	75.596
1998	75.669
1999	76.018
2000	76.87
2001	76.773
2002	77.445
2003	77.387
2004	77.616
2005	78.016
2006	78.261
2007	77.826
2008	78.484
2009	78.741
2010	78.501
2011	79.11
2012	79.023
2013	79.339
2014	79.473
2015	79.746
2016	80.079
2017	80.35
2018	80.133
2019	80.326
2020	79.377
2021	78.944
2022	79.519