Year	years
1960	59.977
1961	60.272
1962	60.449
1963	60.741
1964	61.049
1965	61.371
1966	61.676
1967	61.972
1968	62.365
1969	62.62
1970	62.905
1971	63.116
1972	63.364
1973	63.419
1974	63.896
1975	64.056
1976	64.843
1977	64.727
1978	64.142
1979	64.025
1980	64.241
1981	64.432
1982	65.233
1983	66.147
1984	66.036
1985	65.763
1986	65.803
1987	65.511
1988	65.811
1989	66.349
1990	66.845
1991	65.766
1992	67.421
1993	67.371
1994	67.626
1995	67.459
1996	67.409
1997	67.667
1998	68.19
1999	68.571
2000	68.826
2001	68.794
2002	68.922
2003	69.078
2004	69.183
2005	69.434
2006	69.473
2007	69.417
2008	69.319
2009	69.068
2010	69.278
2011	69.301
2012	69.509
2013	69.684
2014	70.013
2015	69.76
2016	70.067
2017	70.04
2018	70.225
2019	68.445
2020	69.102
2021	68.121
2022	70.757