Year	years
1960	56.391
1961	57.462
1962	56.482
1963	59.488
1964	60.35
1965	60.977
1966	61.798
1967	62.39
1968	62.858
1969	63.365
1970	63.891
1971	64.433
1972	65.033
1973	65.585
1974	66.064
1975	66.595
1976	67.023
1977	67.401
1978	67.738
1979	68.024
1980	68.28
1981	68.503
1982	68.701
1983	68.885
1984	69.081
1985	69.218
1986	69.409
1987	69.562
1988	69.705
1989	69.841
1990	69.975
1991	70.136
1992	70.269
1993	70.452
1994	70.658
1995	70.886
1996	71.15
1997	71.397
1998	71.641
1999	71.875
2000	72.086
2001	72.289
2002	72.43
2003	72.578
2004	72.663
2005	72.756
2006	72.81
2007	72.844
2008	72.862
2009	72.851
2010	72.843
2011	72.845
2012	72.803
2013	72.774
2014	72.741
2015	72.714
2016	72.697
2017	72.685
2018	72.668
2019	72.706
2020	72.749
2021	72.602
2022	72.509