Year	years
1960	54.688
1961	55.315
1962	55.89
1963	56.46
1964	53.601
1965	57.54
1966	57.922
1967	58.553
1968	59.076
1969	59.64
1970	60.18
1971	60.704
1972	61.23
1973	61.747
1974	62.25
1975	62.764
1976	63.214
1977	63.642
1978	63.999
1979	64.39
1980	64.748
1981	65.095
1982	65.419
1983	65.736
1984	66.048
1985	66.347
1986	66.623
1987	66.883
1988	67.188
1989	67.471
1990	67.658
1991	67.881
1992	68.385
1993	68.701
1994	68.98
1995	69.298
1996	69.588
1997	69.875
1998	70.171
1999	70.456
2000	70.746
2001	71.019
2002	71.276
2003	71.496
2004	71.696
2005	71.754
2006	72.021
2007	72.1
2008	72.155
2009	70.066
2010	72.249
2011	72.26
2012	72.167
2013	72.391
2014	72.463
2015	72.515
2016	72.54
2017	72.59
2018	72.636
2019	72.157
2020	72.768
2021	72.767
2022	72.598