Year	years
1960	45.369
1961	45.985
1962	46.434
1963	46.747
1964	46.946
1965	46.84
1966	46.619
1967	46.736
1968	46.871
1969	46.934
1970	47.805
1971	48.868
1972	50.031
1973	51.532
1974	52.478
1975	53.08
1976	48.052
1977	53.534
1978	53.245
1979	53.2
1980	52.577
1981	51.964
1982	44.787
1983	55.817
1984	56.862
1985	57.56
1986	58.114
1987	58.857
1988	59.468
1989	59.69
1990	59.622
1991	59.676
1992	59.737
1993	60.216
1994	60.473
1995	60.861
1996	61.502
1997	62.135
1998	62.713
1999	63.421
2000	63.983
2001	64.467
2002	64.887
2003	65.286
2004	65.645
2005	65.737
2006	66.307
2007	66.618
2008	66.907
2009	67.245
2010	67.55
2011	67.907
2012	68.265
2013	68.591
2014	68.882
2015	69.075
2016	69.359
2017	69.613
2018	69.896
2019	70.439
2020	68.258
2021	66.005
2022	65.697