Year	years
1960	74.11
1961	74.59
1962	74.09
1963	74.23
1964	75.11
1965	75.07
1966	75.25
1967	75.72
1968	75.52
1969	75.65
1970	76.16
1971	76.25
1972	76.82
1973	77.05
1974	77.56
1975	78
1976	78.13
1977	78.68
1978	78.66
1979	78.78
1980	78.85
1981	79.13
1982	79.44
1983	79.55
1984	80.03
1985	80.15
1986	80.3
1987	80.66
1988	80.73
1989	80.94
1990	80.71
1991	81.1
1992	81.33
1993	81.43
1994	81.71
1995	81.69
1996	82
1997	82.04
1998	82.5
1999	82.5
2000	82.6
2001	83.1
2002	83.1
2003	83.2
2004	83.7
2005	83.9
2006	84
2007	84.2
2008	84.4
2009	84.4
2010	84.5
2011	85
2012	84.9
2013	85
2014	85.4
2015	85.1
2016	85.6
2017	85.6
2018	85.7
2019	85.8
2020	85.1
2021	85.8
2022	85.4