Year	years
1960	71.03
1961	72.06
1962	71.3
1963	72.02
1964	72.96
1965	73.23
1966	73.18
1967	72.56
1968	73.32
1969	72.74
1970	73.51
1971	73.24
1972	73.23
1973	73.77
1974	73.6
1975	73.58
1976	73.92
1977	73.5
1978	73.72
1979	74.11
1980	73.99
1981	74.43
1982	74.08
1983	74.48
1984	74.66
1985	74.46
1986	75.06
1987	74.81
1988	74.99
1989	75.19
1990	75.15
1991	74.88
1992	75.09
1993	75.26
1994	75.25
1995	74.9
1996	74.58
1997	73.87
1998	74.8
1999	75.1
2000	75.3
2001	75.2
2002	75.4
2003	75.6
2004	76.2
2005	76.3
2006	76.3
2007	76.3
2008	76.6
2009	77.1
2010	77.2
2011	77.8
2012	77.9
2013	78.6
2014	78
2015	78.2
2016	78.5
2017	78.4
2018	78.6
2019	78.8
2020	77.5
2021	75.1
2022	78.1