Year	years
1960	74.2
1961	73.9
1962	74
1963	73.9
1964	74.8
1965	74.8
1966	74.8
1967	75.3
1968	74.9
1969	75
1970	75.2
1971	75.5
1972	75.3
1973	75.5
1974	75.7
1975	75.9
1976	75.9
1977	76.4
1978	76.3
1979	76.4
1980	76.8
1981	77.1
1982	77.2
1983	77.4
1984	77.8
1985	77.6
1986	77.9
1987	78.2
1988	78.3
1989	78.4
1990	78.8
1991	78.9
1992	79.2
1993	79.1
1994	79.6
1995	79.5
1996	79.7
1997	79.9
1998	79.7
1999	79.9
2000	80.2
2001	80.4
2002	80.5
2003	80.7
2004	81
2005	81.2
2006	81.4
2007	81.6
2008	81.7
2009	82.1
2010	82.4
2011	83
2012	82.8
2013	82.9
2014	83.2
2015	82.8
2016	83
2017	83.1
2018	83.1
2019	83.3
2020	82.4
2021	82.8
2022	83.8