Year	years
1960	32.575
1961	33.063
1962	33.583
1963	34.134
1964	34.714
1965	35.334
1966	35.99
1967	36.656
1968	37.32
1969	38.187
1970	39.023
1971	39.831
1972	40.718
1973	41.564
1974	42.381
1975	43.211
1976	44.062
1977	44.863
1978	45.679
1979	46.455
1980	47.239
1981	48.048
1982	48.86
1983	49.656
1984	50.441
1985	51.147
1986	51.923
1987	52.712
1988	53.462
1989	54.174
1990	54.848
1991	55.504
1992	56.268
1993	56.947
1994	57.464
1995	58.306
1996	58.986
1997	59.598
1998	60.263
1999	60.94
2000	60.712
2001	62.134
2002	62.727
2003	63.335
2004	63.898
2005	64.427
2006	64.915
2007	65.515
2008	66.073
2009	66.495
2010	67.027
2011	67.407
2012	67.836
2013	68.233
2014	68.567
2015	68.875
2016	69.141
2017	69.371
2018	69.602
2019	69.813
2020	69.965
2021	70.141
2022	70.57