Year	years
1960	42.017
1961	43.795
1962	44.297
1963	44.82
1964	45.392
1965	45.973
1966	46.562
1967	47.19
1968	47.778
1969	48.315
1970	48.807
1971	49.243
1972	49.719
1973	50.171
1974	50.673
1975	51.244
1976	51.936
1977	52.704
1978	53.499
1979	54.351
1980	55.219
1981	56.036
1982	56.897
1983	57.724
1984	58.49
1985	59.286
1986	60.041
1987	60.711
1988	61.32
1989	61.899
1990	62.448
1991	62.946
1992	63.401
1993	63.872
1994	64.346
1995	64.736
1996	65.238
1997	65.629
1998	66.018
1999	66.406
2000	66.787
2001	67.18
2002	67.547
2003	67.915
2004	68.231
2005	68.704
2006	69.128
2007	69.604
2008	70.048
2009	70.458
2010	70.829
2011	71.269
2012	71.679
2013	72.122
2014	72.538
2015	72.92
2016	73.284
2017	73.66
2018	73.986
2019	74.27
2020	73.92
2021	74.042
2022	74.973