Year	years
1960	73.9
1961	73.7
1962	74.1
1963	74.2
1964	74.3
1965	74.3
1966	74.3
1967	74.7
1968	74.3
1969	74.7
1970	74.5
1971	75
1972	74.8
1973	75.1
1974	75.1
1975	75.6
1976	75.7
1977	75.6
1978	76.4
1979	76.5
1980	75.8
1981	76.9
1982	76.9
1983	76.9
1984	77.7
1985	76.8
1986	77.4
1987	77.2
1988	77.6
1989	78
1990	78.4
1991	78.9
1992	79.3
1993	79.2
1994	79.7
1995	79.5
1996	79.4
1997	80.1
1998	80.8
1999	80.4
2000	81.3
2001	81.1
2002	81.1
2003	81.4
2004	81.7
2005	81.9
2006	82.2
2007	82.2
2008	82.4
2009	82.7
2010	82.8
2011	83
2012	83.2
2013	83.3
2014	83.27
2015	83.4
2016	83.4
2017	83.6
2018	83.5
2019	83.9
2020	84.1
2021	84
2022	84.4