Year	years
1960	65.014
1961	65.067
1962	65.124
1963	65.155
1964	66.23
1965	65.81
1966	65.738
1967	65.886
1968	65.52
1969	64.922
1970	65.034
1971	65.362
1972	65.138
1973	65.458
1974	65.583
1975	64.669
1976	64.113
1977	64.578
1978	63.965
1979	63.84
1980	63.681
1981	64.1
1982	64.2
1983	64.4
1984	64.4
1985	64.6
1986	65.5
1987	66.4
1988	66.6
1989	65.6
1990	64.5
1991	64.3
1992	63.4
1993	62.3
1994	60.5
1995	61.3
1996	64.1
1997	64.2
1998	63.7
1999	64.6
2000	65.1
2001	64.6
2002	65.1
2003	66
2004	66.3
2005	67.3
2006	67.35
2007	67.4
2008	68.6
2009	69.8
2010	70.6
2011	71.4
2012	71.4
2013	72.8
2014	72.4
2015	73.2
2016	73.3
2017	73.8
2018	74
2019	74.5
2020	74.4
2021	72.7
2022	73.7