Year	years
1960	72.77
1961	73.63
1962	73.18
1963	73.14
1964	73.9
1965	73.76
1966	73.8
1967	74.25
1968	73.92
1969	74.13
1970	74.25
1971	74.4
1972	74.76
1973	74.98
1974	75.31
1975	75.28
1976	75.49
1977	76.18
1978	76.14
1979	76.61
1980	76.69
1981	77.12
1982	77.33
1983	77.27
1984	77.98
1985	78.08
1986	78.23
1987	78.9
1988	79.1
1989	79.09
1990	79.54
1991	79.67
1992	79.87
1993	79.9
1994	80.19
1995	80.38
1996	80.66
1997	80.7
1998	80.7
1999	81
2000	81
2001	81.2
2002	81.2
2003	81.1
2004	81.9
2005	81.9
2006	82.3
2007	82.6
2008	82.6
2009	82.8
2010	83
2011	83.3
2012	83.1
2013	83.2
2014	83.9
2015	83.4
2016	84
2017	83.9
2018	83.9
2019	84.3
2020	83
2021	84.3
2022	83.9