Year	years
1960	65.814
1961	66.46
1962	64.872
1963	65.839
1964	65.879
1965	65.682
1966	65.901
1967	65.855
1968	66.7
1969	66.089
1970	66.102
1971	65.685
1972	66.885
1973	66.315
1974	66.644
1975	66.923
1976	66.421
1977	67.745
1978	67.868
1979	68.702
1980	69.159
1981	68.94
1982	69.084
1983	69.306
1984	69.622
1985	70.082
1986	70.356
1987	70.88
1988	71.097
1989	71.397
1990	72.411
1991	72
1992	72.6
1993	72.2
1994	73.2
1995	73
1996	73.3
1997	74.1
1998	73.7
1999	74.6
2000	74.8
2001	74.8
2002	74.6
2003	74.8
2004	76
2005	76.7
2006	76.8
2007	76.7
2008	78.1
2009	78.1
2010	77.9
2011	78.5
2012	79.1
2013	79.8
2014	79.4
2015	80
2016	80.1
2017	79.9
2018	80.1
2019	80.2
2020	79.9
2021	80.5
2022	80.9