Year	years
1960	74.87
1961	75.39
1962	75.43
1963	75.64
1964	75.91
1965	76.1
1966	76.45
1967	76.54
1968	76.37
1969	76.61
1970	77.2
1971	77.4
1972	77.53
1973	77.71
1974	77.9
1975	77.94
1976	77.94
1977	78.54
1978	78.66
1979	78.71
1980	78.85
1981	79.13
1982	79.38
1983	79.63
1984	79.93
1985	79.7
1986	80.03
1987	80.15
1988	79.95
1989	80.8
1990	80.4
1991	80.53
1992	80.78
1993	80.77
1994	81.37
1995	81.45
1996	81.52
1997	81.82
1998	81.9
1999	81.9
2000	82
2001	82.1
2002	82.1
2003	82.4
2004	82.7
2005	82.8
2006	82.9
2007	83
2008	83.2
2009	83.4
2010	83.5
2011	83.8
2012	83.6
2013	83.8
2014	84.2
2015	84.1
2016	84.1
2017	84.1
2018	84.3
2019	84.8
2020	84.2
2021	84.9
2022	84.8