Year	years
1960	62.182
1961	63.016
1962	63.696
1963	63.843
1964	64.15
1965	64.513
1966	64.897
1967	65.112
1968	65.299
1969	65.637
1970	65.898
1971	66.042
1972	66.218
1973	66.712
1974	67.115
1975	67.721
1976	68.048
1977	68.396
1978	68.677
1979	68.868
1980	69.8
1981	70.1
1982	70.2
1983	70.5
1984	70.9
1985	71.5
1986	72.1
1987	72.5
1988	72.6
1989	72.8
1990	73.1
1991	73.5
1992	73.8
1993	73.9
1994	74.1
1995	74.1
1996	74.4
1997	74.8
1998	75.3
1999	75.6
2000	76
2001	76.3
2002	76.6
2003	76.6
2004	77.1
2005	77.6
2006	77.8
2007	78.1
2008	78.4
2009	78.9
2010	79.2
2011	79.5
2012	79.8
2013	80.1
2014	80.3
2015	80.5
2016	80.7
2017	80.9
2018	81.2
2019	81.4
2020	81.3
2021	80.8
2022	80.7