Year	years
1960	55.909
1961	55.818
1962	57.183
1963	58.608
1964	59.037
1965	59.593
1966	60.022
1967	60.504
1968	60.795
1969	60.824
1970	61.291
1971	60.747
1972	60.187
1973	60.275
1974	61.722
1975	63.098
1976	63.682
1977	63.781
1978	63.352
1979	63.233
1980	63.358
1981	63.879
1982	64.279
1983	64.634
1984	65.278
1985	65.795
1986	65.511
1987	65.476
1988	65.45
1989	64.992
1990	65.188
1991	66.15
1992	66.972
1993	67.58
1994	67.294
1995	67.152
1996	67.313
1997	67.853
1998	67.69
1999	68.709
2000	69.781
2001	70.2
2002	70.452
2003	70.768
2004	71.303
2005	71.362
2006	71.288
2007	71.367
2008	71.374
2009	71.393
2010	71.27
2011	71.538
2012	71.669
2013	71.457
2014	70.966
2015	70.763
2016	71.74
2017	71.84
2018	71.467
2019	71.572
2020	71.627
2021	71.682
2022	72.027