Year	years
1960	62.594
1961	62.634
1962	62.852
1963	63.287
1964	63.022
1965	63.261
1966	63.812
1967	63.318
1968	63.364
1969	63.285
1970	63.694
1971	64.087
1972	64.512
1973	65.103
1974	65.453
1975	65.612
1976	65.927
1977	66.096
1978	65.944
1979	65.795
1980	65.916
1981	65.774
1982	65.68
1983	65.321
1984	65.392
1985	65.733
1986	65.884
1987	66.073
1988	66.504
1989	66.742
1990	67.138
1991	67.506
1992	67.658
1993	67.888
1994	68.197
1995	68.669
1996	68.475
1997	68.599
1998	68.139
1999	66.613
2000	68.9
2001	69.6
2002	69.7
2003	69.9
2004	70
2005	70.2
2006	70.8
2007	70.9
2008	71.3
2009	71.4
2010	71.8
2011	72
2012	72.3
2013	72.6
2014	72.8
2015	72.8
2016	73.2
2017	73.1
2018	73.5
2019	73.4
2020	71.6
2021	70
2022	72.97