Year	years
1960	71.74
1961	71.98
1962	71.647
1963	72.097
1964	72.686
1965	72.371
1966	72.576
1967	72.327
1968	72.43
1969	71.925
1970	73.44
1971	73.77
1972	73.62
1973	73.56
1974	73.77
1975	73.23
1976	73.05
1977	73.2
1978	73.23
1979	73.02
1980	72.96
1981	73.19
1982	73.64
1983	73.42
1984	72.97
1985	73.24
1986	74.23
1987	74.27
1988	74.53
1989	74.35
1990	74.3
1991	73.75
1992	71.99
1993	71.2
1994	71.73
1995	71.59
1996	72.4
1997	72.84
1998	73.13
1999	72.4
2000	72.26
2001	72.17
2002	71.9
2003	71.85
2004	72.36
2005	72.47
2006	73.34
2007	74.02
2008	74.28
2009	74.79
2010	74.88
2011	75.61
2012	75.86
2013	76.3
2014	76.47
2015	76.71
2016	77.06
2017	77.64
2018	77.82
2019	78.17
2020	76.43
2021	74.51
2022	77.77