Year	years
1960	65.93
1961	66.78
1962	65.7
1963	66.64
1964	67.02
1965	66.72
1966	67.52
1967	66.89
1968	66.64
1969	66.7
1970	66.35
1971	66.15
1972	66.85
1973	66.64
1974	66.37
1975	66.29
1976	66.7
1977	66.77
1978	66.15
1979	66.23
1980	65.53
1981	65.51
1982	65.67
1983	65.12
1984	65.06
1985	65.06
1986	65.31
1987	65.7
1988	66.16
1989	65.33
1990	65.14
1991	65.06
1992	64.6
1993	64.55
1994	64.86
1995	65.26
1996	66.08
1997	66.4
1998	66.15
1999	66.36
2000	67.1
2001	68.2
2002	68.3
2003	68.3
2004	68.6
2005	68.6
2006	69
2007	69.2
2008	69.8
2009	70.1
2010	70.5
2011	71.2
2012	71.6
2013	72.2
2014	72.3
2015	72.3
2016	72.6
2017	72.5
2018	72.7
2019	73.1
2020	72.3
2021	70.7
2022	72.7