Year	years
1960	71.66
1961	71.98
1962	72.08
1963	72.36
1964	73.14
1965	73.57
1966	73.78
1967	74.07
1968	74.36
1969	73.89
1970	74.87
1971	74.56
1972	75.63
1973	75.52
1974	75.92
1975	76.31
1976	76.68
1977	77.2
1978	77.42
1979	78.02
1980	78.53
1981	78.74
1982	79.32
1983	79.1
1984	79.64
1985	79.64
1986	79.85
1987	80.17
1988	80.23
1989	80.44
1990	80.51
1991	80.7
1992	81.19
1993	81.26
1994	81.62
1995	81.73
1996	81.88
1997	82.21
1998	82.2
1999	82.2
2000	82.5
2001	82.8
2002	83
2003	83
2004	83.2
2005	83.5
2006	84.1
2007	84.1
2008	84.3
2009	84.6
2010	84.7
2011	85.6
2012	85.5
2013	86.1
2014	86.2
2015	85.7
2016	86.3
2017	86.1
2018	86.3
2019	86.7
2020	85.2
2021	86.2
2022	85.9