Year	years
1960	55.724
1961	56.993
1962	58.041
1963	58.889
1964	59.966
1965	60.883
1966	61.796
1967	62.687
1968	63.512
1969	63.85
1970	64.267
1971	64.548
1972	64.648
1973	64.831
1974	65.564
1975	65.921
1976	66.256
1977	66.887
1978	67.332
1979	67.359
1980	67.7
1981	68.467
1982	69.052
1983	69.91
1984	70.376
1985	70.117
1986	70.281
1987	70.005
1988	70.053
1989	70.215
1990	70.326
1991	70.602
1992	70.799
1993	71.114
1994	70.992
1995	71.002
1996	70.904
1997	70.775
1998	70.69
1999	70.709
2000	70.768
2001	71.135
2002	71.472
2003	71.771
2004	72.028
2005	72.245
2006	72.465
2007	72.599
2008	72.698
2009	72.722
2010	72.72
2011	72.944
2012	72.882
2013	72.735
2014	72.864
2015	73.138
2016	73.112
2017	73.127
2018	73.357
2019	73.445
2020	73.416
2021	71.111
2022	71.294