Year	years
1960	52.669
1961	53.085
1962	53.376
1963	53.633
1964	53.906
1965	54.192
1966	54.391
1967	54.626
1968	54.876
1969	55.194
1970	55.579
1971	55.955
1972	56.272
1973	56.722
1974	57.117
1975	57.512
1976	58.006
1977	58.492
1978	58.979
1979	59.395
1980	59.813
1981	60.364
1982	60.933
1983	61.465
1984	61.907
1985	62.38
1986	62.912
1987	63.041
1988	63.345
1989	63.31
1990	63.375
1991	63.265
1992	63.341
1993	63.045
1994	62.612
1995	62.262
1996	61.459
1997	60.805
1998	60.001
1999	59.241
2000	58.47
2001	57.261
2002	55.666
2003	54.331
2004	54.043
2005	53.98
2006	54.278
2007	54.992
2008	56.022
2009	57.447
2010	58.899
2011	60.651
2012	61.846
2013	62.533
2014	63.38
2015	63.95
2016	64.747
2017	65.402
2018	65.674
2019	66.175
2020	65.252
2021	62.341
2022	61.48