Year	years
1960	56.793
1961	57.817
1962	57.667
1963	59.779
1964	60.582
1965	61.193
1966	61.963
1967	62.511
1968	63.005
1969	63.553
1970	64.11
1971	64.699
1972	65.35
1973	65.963
1974	66.528
1975	67.107
1976	67.608
1977	68.075
1978	68.487
1979	68.862
1980	69.246
1981	69.54
1982	69.841
1983	70.09
1984	70.358
1985	70.582
1986	70.847
1987	71.019
1988	71.236
1989	71.445
1990	71.656
1991	71.871
1992	72.081
1993	72.312
1994	72.553
1995	72.816
1996	73.1
1997	73.364
1998	73.619
1999	73.863
2000	74.08
2001	74.276
2002	74.426
2003	74.561
2004	74.65
2005	74.731
2006	74.783
2007	74.818
2008	74.84
2009	74.846
2010	74.849
2011	74.858
2012	74.827
2013	74.799
2014	74.779
2015	74.75
2016	74.733
2017	74.722
2018	74.712
2019	74.748
2020	74.795
2021	74.642
2022	74.551