Year	years
1960	73.3
1961	73.6
1962	73.9
1963	74.1
1964	74.3
1965	74.5
1966	74.7
1967	74.9
1968	75.1
1969	75.3
1970	75.5
1971	75.8
1972	76
1973	76.3
1974	76.6
1975	76.9
1976	77.2
1977	77.5
1978	77.7
1979	78
1980	78.2
1981	78.5
1982	78.7
1983	79
1984	79.2
1985	79.5
1986	79.8
1987	80
1988	80.3
1989	80.6
1990	80.8
1991	81.1
1992	81.3
1993	81.5
1994	81.9
1995	81.9
1996	82
1997	82.3
1998	82.6
1999	82.7
2000	83
2001	83
2002	83
2003	82.7
2004	83.8
2005	83.8
2006	84.5
2007	84.8
2008	84.8
2009	85
2010	85.3
2011	85.7
2012	85.4
2013	85.6
2014	86.1
2015	85.6
2016	85.8
2017	85.7
2018	85.8
2019	85.9
2020	85.3
2021	85.5
2022	85.2