Year	years
1960	55.089
1961	55.7
1962	56.386
1963	56.888
1964	57.513
1965	57.137
1966	57.322
1967	57.519
1968	57.655
1969	57.813
1970	57.964
1971	58.008
1972	58.06
1973	58.221
1974	58.401
1975	58.57
1976	58.739
1977	58.906
1978	59.128
1979	59.248
1980	59.401
1981	59.61
1982	59.768
1983	59.89
1984	60.149
1985	60.318
1986	59.922
1987	60.139
1988	60.368
1989	61.191
1990	61.378
1991	61.587
1992	61.708
1993	62.052
1994	62.379
1995	62.412
1996	62.669
1997	62.826
1998	62.623
1999	62.501
2000	62.548
2001	62.582
2002	62.589
2003	62.649
2004	63.428
2005	63.981
2006	64.509
2007	65.115
2008	65.685
2009	66.305
2010	66.539
2011	66.543
2012	66.473
2013	66.45
2014	66.6
2015	67.571
2016	68.46
2017	69.231
2018	69.285
2019	68.944
2020	69.264
2021	67.207
2022	67.189