Year	years
1960	55.619
1961	56.345
1962	57.056
1963	57.736
1964	54.213
1965	59.091
1966	59.552
1967	60.314
1968	60.983
1969	61.719
1970	62.403
1971	63.052
1972	63.728
1973	64.421
1974	65.068
1975	65.701
1976	66.282
1977	66.833
1978	67.353
1979	67.827
1980	68.249
1981	68.654
1982	68.983
1983	69.336
1984	69.608
1985	69.926
1986	70.201
1987	70.491
1988	70.747
1989	70.985
1990	71.049
1991	71.2
1992	71.719
1993	72.006
1994	72.273
1995	72.536
1996	72.797
1997	73.057
1998	73.315
1999	73.569
2000	73.828
2001	74.071
2002	74.309
2003	74.497
2004	74.694
2005	74.686
2006	74.964
2007	75.014
2008	75.042
2009	72.494
2010	75.048
2011	74.983
2012	74.848
2013	75.099
2014	75.142
2015	75.188
2016	75.215
2017	75.27
2018	75.314
2019	74.805
2020	75.459
2021	75.503
2022	75.333