Year	years
1960	70.6
1961	70.8
1962	70.5
1963	71.5
1964	71.6
1965	72.4
1966	72.9
1967	72.6
1968	73.6
1969	73.1
1970	73.3
1971	73.3
1972	74.2
1973	74.3
1974	74.6
1975	74.3
1976	74.6
1977	74.5
1978	74.5
1979	74.9
1980	74.4
1981	75.2
1982	75.2
1983	75.2
1984	75
1985	74.8
1986	75.1
1987	75.2
1988	75.67
1989	75.5
1990	75.5
1991	75.3
1992	75.7
1993	76
1994	76.1
1995	76.4
1996	76.6
1997	77
1998	77.3
1999	77.5
2000	78
2001	78.4
2002	78.8
2003	78.9
2004	79.2
2005	79.4
2006	79.6
2007	79.7
2008	80
2009	80.1
2010	80.6
2011	81.1
2012	81.1
2013	81.2
2014	81.7
2015	81.6
2016	82
2017	81.8
2018	81.7
2019	81.9
2020	80.7
2021	79.6
2022	81.3