Year	years
1960	74.15
1961	74.45
1962	74.43
1963	74.5
1964	75.08
1965	75.14
1966	75.39
1967	75.66
1968	75.78
1969	76.01
1970	76.25
1971	76.63
1972	76.55
1973	76.83
1974	76.91
1975	77.23
1976	77.59
1977	77.97
1978	78.32
1979	78.59
1980	78.79
1981	79.16
1982	79.29
1983	79.61
1984	79.82
1985	79.8
1986	79.87
1987	80.19
1988	80.27
1989	80.49
1990	80.73
1991	80.81
1992	81.07
1993	80.86
1994	80.95
1995	81.03
1996	81.15
1997	81.25
1998	81.41
1999	81.61
2000	81.82
2001	82
2002	82.02
2003	82.23
2004	82.42
2005	82.52
2006	82.91
2007	82.91
2008	83.05
2009	83.33
2010	83.54
2011	83.68
2012	83.82
2013	83.85
2014	83.91
2015	83.89
2016	84.03
2017	84.02
2018	83.99
2019	84.37
2020	83.95
2021	84.02
2022	83.58