Year	years
1960	49.064
1961	49.564
1962	50.076
1963	50.588
1964	50.926
1965	51.472
1966	51.991
1967	52.52
1968	53.075
1969	53.606
1970	54.18
1971	54.736
1972	55.239
1973	55.854
1974	56.355
1975	56.88
1976	57.381
1977	57.907
1978	58.446
1979	58.85
1980	59.495
1981	60.031
1982	60.507
1983	61.04
1984	61.515
1985	61.946
1986	62.642
1987	62.338
1988	63.603
1989	63.679
1990	64.063
1991	64.86
1992	64.981
1993	65.219
1994	65.418
1995	65.6
1996	66.535
1997	66.61
1998	66.653
1999	66.275
2000	66.865
2001	66.962
2002	67.159
2003	67.214
2004	67.257
2005	67.343
2006	67.427
2007	67.505
2008	67.566
2009	67.623
2010	67.599
2011	67.508
2012	67.472
2013	67.49
2014	67.499
2015	67.551
2016	67.652
2017	67.645
2018	67.75
2019	67.801
2020	68.547
2021	68.397
2022	68.316