Year	years
1960	63.394
1961	63.489
1962	63.161
1963	63.624
1964	64.254
1965	63.618
1966	63.449
1967	63.086
1968	62.784
1969	62.068
1970	63.08
1971	63.24
1972	63.25
1973	63.28
1974	63.13
1975	62.48
1976	62.19
1977	61.83
1978	61.83
1979	61.49
1980	61.39
1981	61.62
1982	62.25
1983	62.16
1984	61.71
1985	62.73
1986	64.78
1987	64.84
1988	64.64
1989	64.24
1990	63.73
1991	63.45
1992	62
1993	58.97
1994	57.55
1995	58.12
1996	59.62
1997	60.85
1998	61.22
1999	59.87
2000	59.03
2001	58.92
2002	58.68
2003	58.53
2004	58.91
2005	58.92
2006	60.43
2007	61.46
2008	61.92
2009	62.87
2010	63.09
2011	64.04
2012	64.56
2013	65.13
2014	65.29
2015	65.92
2016	66.5
2017	67.51
2018	67.75
2019	68.24
2020	66.49
2021	65.51
2022	67.57