Year	years
1960	47.741
1961	48.434
1962	49.254
1963	50.049
1964	50.859
1965	51.659
1966	52.461
1967	53.208
1968	54.239
1969	55.163
1970	56.072
1971	56.978
1972	57.797
1973	58.594
1974	59.356
1975	58.078
1976	60.749
1977	60.864
1978	61.911
1979	62.388
1980	62.8
1981	63.161
1982	63.509
1983	63.762
1984	63.998
1985	64.29
1986	63.76
1987	64.764
1988	64.973
1989	65.186
1990	65.392
1991	65.579
1992	65.767
1993	65.958
1994	66.188
1995	66.381
1996	66.59
1997	66.742
1998	66.92
1999	67.069
2000	67.225
2001	67.364
2002	67.515
2003	67.644
2004	67.801
2005	67.936
2006	68.09
2007	67.986
2008	68.404
2009	68.466
2010	68.732
2011	68.908
2012	69.084
2013	69.188
2014	69.234
2015	69.583
2016	69.801
2017	69.988
2018	70.173
2019	70.382
2020	70.199
2021	70.348
2022	70.742