Year	years
1960	38.559
1961	38.855
1962	39.153
1963	39.453
1964	39.994
1965	40.446
1966	40.866
1967	41.404
1968	41.802
1969	42.334
1970	42.827
1971	43.312
1972	43.689
1973	44.044
1974	44.464
1975	45.04
1976	45.544
1977	46.005
1978	46.682
1979	47.266
1980	47.889
1981	48.387
1982	48.936
1983	49.431
1984	50.225
1985	50.882
1986	51.535
1987	52.475
1988	53.071
1989	54.127
1990	54.833
1991	55.712
1992	56.71
1993	57.619
1994	58.553
1995	59.318
1996	59.981
1997	60.771
1998	61.549
1999	62.113
2000	62.614
2001	63.336
2002	63.264
2003	64.197
2004	64.818
2005	65.457
2006	65.868
2007	66.329
2008	66.421
2009	66.761
2010	66.814
2011	67.313
2012	67.47
2013	67.965
2014	68.085
2015	67.456
2016	68.776
2017	68.91
2018	68.979
2019	69.558
2020	69.246
2021	68.45
2022	70.484