Year	years
1960	55.125
1961	56.693
1962	56.377
1963	55.653
1964	57.783
1965	58.739
1966	60.734
1967	60.782
1968	61.495
1969	61.509
1970	62.155
1971	62.942
1972	63.895
1973	64.261
1974	64.892
1975	65.319
1976	65.968
1977	66.561
1978	67.605
1979	67.759
1980	67.232
1981	67.77
1982	68.098
1983	67.47
1984	67.912
1985	67.885
1986	68.503
1987	68.521
1988	68.937
1989	69.09
1990	68.826
1991	69.522
1992	68.847
1993	69.457
1994	69.4
1995	69.8
1996	70.3
1997	70.3
1998	70.2
1999	70.4
2000	70.8
2001	70.9
2002	70.6
2003	70.9
2004	71.5
2005	71.6
2006	71.7
2007	71.8
2008	72.4
2009	72.3
2010	72.9
2011	73.1
2012	73
2013	73.4
2014	73.5
2015	73.5
2016	73.4
2017	74.1
2018	74.6
2019	74.7
2020	72.2
2021	71.1
2022	72.22