Year	years
1960	60.957
1961	61.362
1962	61.991
1963	62.544
1964	63.169
1965	63.853
1966	64.565
1967	65.237
1968	65.898
1969	66.578
1970	67.236
1971	67.833
1972	68.286
1973	68.588
1974	69.003
1975	69.24
1976	69.532
1977	69.733
1978	69.959
1979	70.126
1980	70.269
1981	70.409
1982	70.292
1983	70.644
1984	70.725
1985	70.814
1986	70.919
1987	71.021
1988	71.155
1989	71.257
1990	71.365
1991	71.621
1992	71.782
1993	71.932
1994	72.066
1995	72.204
1996	72.328
1997	72.437
1998	72.565
1999	72.668
2000	72.76
2001	72.795
2002	72.936
2003	73.021
2004	73.113
2005	73.063
2006	73.13
2007	73.209
2008	73.272
2009	73.056
2010	73.381
2011	73.424
2012	73.454
2013	73.485
2014	73.489
2015	73.528
2016	73.561
2017	73.58
2018	73.614
2019	73.669
2020	73.698
2021	73.719
2022	74.123