Year	years
1960	66.507
1961	66.487
1962	66.238
1963	66.507
1964	67.006
1965	66.624
1966	66.489
1967	66.063
1968	65.906
1969	65.18
1970	64.908
1971	65.168
1972	65.049
1973	65.127
1974	64.895
1975	64.699
1976	64.737
1977	64.281
1978	64.119
1979	63.757
1980	63.537
1981	63.766
1982	63.963
1983	64.022
1984	63.658
1985	64.078
1986	65.858
1987	66.3
1988	66.4
1989	66.1
1990	65.6
1991	64.62
1992	63.81
1993	63.16
1994	62.39
1995	61.22
1996	61.52
1997	62.23
1998	63.17
1999	62.62
2000	62.1
2001	62.32
2002	62.7
2003	62.64
2004	62.6
2005	62.23
2006	62.38
2007	62.51
2008	62.51
2009	63.79
2010	65.28
2011	65.98
2012	66.11
2013	66.34
2014	66.25
2015	66.37
2016	66.73
2017	67.02
2018	66.69
2019	66.92
2020	66.39
2021	65.16
2022	63.525