Year	years
1960	42.511
1961	42.861
1962	43.286
1963	43.545
1964	43.885
1965	44.329
1966	44.324
1967	44.798
1968	45.225
1969	45.361
1970	45.709
1971	46.119
1972	46.267
1973	46.478
1974	46.602
1975	46.999
1976	46.8
1977	47.188
1978	47.494
1979	48.096
1980	49.045
1981	49.697
1982	50.253
1983	50.843
1984	51.484
1985	52.079
1986	52.702
1987	53.224
1988	53.929
1989	54.579
1990	55.079
1991	55.783
1992	56.349
1993	56.864
1994	57.179
1995	57.857
1996	58.397
1997	58.901
1998	59.317
1999	59.342
2000	59.941
2001	60.755
2002	61.293
2003	62.013
2004	62.399
2005	63.149
2006	63.717
2007	64.286
2008	64.593
2009	65.438
2010	66.156
2011	66.591
2012	67.368
2013	67.663
2014	68.507
2015	68.724
2016	69.346
2017	69.468
2018	69.572
2019	70.234
2020	70.594
2021	70.078
2022	71.164