Year	years
1960	74
1961	74.2
1962	74.2
1963	74.2
1964	74.2
1965	74.2
1966	74.2
1967	74.26
1968	74.32
1969	74.38
1970	74.44
1971	74.5
1972	74.92
1973	75.34
1974	75.76
1975	76.18
1976	76.6
1977	76.94
1978	77.28
1979	77.62
1980	77.96
1981	78.3
1982	78.48
1983	78.66
1984	78.84
1985	79.02
1986	79.2
1987	79.44
1988	79.68
1989	79.92
1990	80.16
1991	80.4
1992	80.4
1993	80.9
1994	80.9
1995	80.8
1996	81.1
1997	81.4
1998	81.5
1999	81.8
2000	82
2001	82.4
2002	82.6
2003	82.8
2004	83
2005	83.3
2006	83.5
2007	83.7
2008	83.7
2009	83.9
2010	84
2011	84.2
2012	84.3
2013	84.3
2014	84.4
2015	84.5
2016	84.6
2017	84.6
2018	84.9
2019	85
2020	85.3
2021	85.4
2022	85.3