Year	years
1960	58.904
1961	59.688
1962	60.464
1963	61.404
1964	62.219
1965	63.183
1966	64.113
1967	64.978
1968	65.787
1969	66.581
1970	67.062
1971	67.609
1972	68.004
1973	68.456
1974	68.762
1975	69.006
1976	69.55
1977	69.73
1978	69.968
1979	70.139
1980	70.359
1981	70.543
1982	70.632
1983	70.71
1984	70.783
1985	70.832
1986	70.835
1987	70.819
1988	70.847
1989	70.801
1990	70.899
1991	70.881
1992	70.808
1993	71.028
1994	71.029
1995	70.971
1996	71.047
1997	71.087
1998	71.058
1999	71.368
2000	71.503
2001	71.912
2002	72.48
2003	72.742
2004	73.153
2005	73.07
2006	72.972
2007	73.277
2008	73.509
2009	73.796
2010	73.959
2011	74.244
2012	74.476
2013	74.671
2014	74.908
2015	75.148
2016	75.366
2017	75.52
2018	75.724
2019	75.909
2020	76.061
2021	75.775
2022	76.507