Year	years
1960	53.491
1961	53.766
1962	53.972
1963	54.185
1964	54.377
1965	54.669
1966	54.748
1967	54.95
1968	55.113
1969	55.258
1970	55.402
1971	55.63
1972	55.973
1973	56.213
1974	56.344
1975	56.655
1976	56.734
1977	56.853
1978	57.09
1979	57.218
1980	61.6
1981	61.95
1982	62.3
1983	63.15
1984	64
1985	64
1986	64.45
1987	64.9
1988	64.8
1989	63.9
1990	63.8
1991	62.6
1992	62.4
1993	60.1
1994	59.7
1995	58
1996	58
1997	58.4
1998	59
1999	60.6
2000	60.2
2001	60.5
2002	60.7
2003	60.5
2004	60.6
2005	60.3
2006	60.6
2007	60.7
2008	61.9
2009	63.55
2010	63.55
2011	63.85
2012	64.74
2013	65.91
2014	66.9
2015	67.49
2016	67.99
2017	68.72
2018	68.84
2019	68.82
2020	67.09
2021	66.33
2022	70.26