Year	years
1960	60.42
1961	54.21
1962	61.105
1963	61.624
1964	61.927
1965	62.327
1966	62.773
1967	63.464
1968	63.942
1969	64.526
1970	65.297
1971	65.552
1972	65.807
1973	66.509
1974	66.65
1975	67.377
1976	68.136
1977	68.594
1978	68.808
1979	69.224
1980	69.353
1981	69.538
1982	69.203
1983	69.652
1984	70.606
1985	70.741
1986	71.573
1987	72.097
1988	72.575
1989	72.836
1990	72.487
1991	71.906
1992	71.462
1993	71.632
1994	72.483
1995	71.981
1996	72.172
1997	71.444
1998	70.884
1999	71.209
2000	71.06
2001	70.95
2002	71.528
2003	71.612
2004	71.853
2005	71.829
2006	72.775
2007	73.484
2008	74.045
2009	74.861
2010	75.37
2011	75.677
2012	76.13
2013	76.266
2014	76.341
2015	76.486
2016	76.668
2017	76.845
2018	77.021
2019	77.247
2020	76.626
2021	74.332
2022	74.685