Year	years
1960	50.263
1961	51.128
1962	51.799
1963	52.396
1964	52.9
1965	53.303
1966	53.653
1967	53.988
1968	54.398
1969	54.743
1970	55.185
1971	56.128
1972	57.038
1973	57.502
1974	57.257
1975	57.046
1976	57.335
1977	58.148
1978	58.726
1979	59.319
1980	59.962
1981	63.448
1982	62.941
1983	62.733
1984	62.432
1985	62.295
1986	61.767
1987	61.617
1988	61.214
1989	60.699
1990	60.444
1991	59.934
1992	59.35
1993	58.605
1994	58.195
1995	57.425
1996	56.955
1997	56.534
1998	56.082
1999	55.924
2000	55.597
2001	55.614
2002	56.056
2003	56.669
2004	57.44
2005	58.523
2006	59.595
2007	60.211
2008	61.225
2009	62.2
2010	62.376
2011	63.001
2012	63.069
2013	63.194
2014	63.979
2015	64.145
2016	64.204
2017	64.961
2018	65.158
2019	65.275
2020	65.062
2021	64.09
2022	64.686