Year	years
1960	54.172
1961	55.228
1962	56.307
1963	57.233
1964	58.309
1965	59.275
1966	60.217
1967	61.123
1968	61.879
1969	62.167
1970	62.321
1971	62.517
1972	62.461
1973	62.63
1974	63.253
1975	63.451
1976	63.555
1977	63.903
1978	64.85
1979	64.937
1980	65.823
1981	66.385
1982	67.05
1983	67.884
1984	67.923
1985	67.403
1986	67.586
1987	67.523
1988	67.731
1989	67.912
1990	68.095
1991	68.265
1992	68.127
1993	68.588
1994	68.58
1995	68.582
1996	68.752
1997	69.057
1998	69.018
1999	68.748
2000	68.446
2001	68.451
2002	68.541
2003	68.704
2004	68.972
2005	69.204
2006	69.442
2007	69.652
2008	69.849
2009	69.844
2010	69.929
2011	70.261
2012	70.208
2013	69.894
2014	69.862
2015	70.107
2016	69.911
2017	69.793
2018	70.023
2019	70.1
2020	70.042
2021	67.838
2022	68.005