Year	years
1960	66.6
1961	66.8
1962	66.9
1963	67.1
1964	67.2
1965	67.3
1966	67.4
1967	67.6
1968	67.7
1969	67.8
1970	68
1971	68.2
1972	68.4
1973	68.6
1974	68.8
1975	69
1976	69.2
1977	69.4
1978	69.7
1979	69.9
1980	70.1
1981	70.3
1982	70.5
1983	70.8
1984	71
1985	71.3
1986	71.6
1987	71.8
1988	72.1
1989	72.3
1990	72.6
1991	72.8
1992	73.1
1993	73.3
1994	73.6
1995	73.8
1996	74.1
1997	74.5
1998	74.8
1999	75
2000	75.3
2001	75.5
2002	75.7
2003	75.7
2004	76.7
2005	76.7
2006	77.3
2007	77.6
2008	77.8
2009	78
2010	78.2
2011	78.7
2012	78.7
2013	79
2014	79.5
2015	79.2
2016	79.5
2017	79.6
2018	79.7
2019	79.9
2020	79.2
2021	79.3
2022	79.4