Year	years
1960	57.415
1961	57.83
1962	58.183
1963	58.594
1964	59.004
1965	59.274
1966	59.668
1967	60.16
1968	60.307
1969	60.764
1970	61.252
1971	61.5
1972	61.937
1973	62.307
1974	62.705
1975	63.06
1976	62.93
1977	63.154
1978	63.555
1979	63.935
1980	64.359
1981	64.79
1982	65.002
1983	65.107
1984	65.596
1985	65.702
1986	66.126
1987	66.42
1988	66.853
1989	66.93
1990	67.213
1991	67.343
1992	67.328
1993	67.306
1994	67.327
1995	67.39
1996	67.21
1997	67.328
1998	67.802
1999	68.292
2000	68.781
2001	68.79
2002	68.972
2003	69.371
2004	69.806
2005	69.636
2006	70.159
2007	70.469
2008	70.816
2009	71.325
2010	71.636
2011	71.888
2012	71.914
2013	71.971
2014	72.014
2015	72.166
2016	71.995
2017	72.227
2018	72.192
2019	72.464
2020	71.984
2021	72.663
2022	72.916