Year	years
1960	38.334
1961	38.605
1962	38.996
1963	39.294
1964	39.833
1965	40.296
1966	40.764
1967	41.23
1968	41.603
1969	42.195
1970	42.522
1971	43.024
1972	43.442
1973	43.831
1974	44.275
1975	44.891
1976	45.34
1977	45.89
1978	46.462
1979	47.093
1980	47.829
1981	48.3
1982	48.953
1983	49.551
1984	50.365
1985	51.026
1986	51.676
1987	52.53
1988	53.099
1989	54.08
1990	54.751
1991	55.412
1992	56.421
1993	57.053
1994	57.873
1995	58.564
1996	59.063
1997	59.706
1998	60.186
1999	60.764
2000	61.199
2001	61.779
2002	61.362
2003	62.376
2004	62.886
2005	63.525
2006	64.015
2007	64.503
2008	64.664
2009	64.985
2010	65.093
2011	65.559
2012	65.736
2013	66.191
2014	66.357
2015	65.835
2016	67.031
2017	67.174
2018	67.231
2019	67.755
2020	67.345
2021	66.574
2022	68.608