Year	years
1960	50.372
1961	50.891
1962	51.389
1963	51.881
1964	52.349
1965	52.809
1966	53.264
1967	53.721
1968	54.188
1969	54.684
1970	55.197
1971	55.745
1972	56.3
1973	56.861
1974	57.424
1975	57.998
1976	58.583
1977	59.169
1978	59.691
1979	60.176
1980	60.646
1981	61.125
1982	61.57
1983	62.004
1984	62.364
1985	62.626
1986	62.678
1987	62.522
1988	61.755
1989	61.427
1990	60.533
1991	59.473
1992	58.348
1993	57.719
1994	56.154
1995	55.059
1996	54.357
1997	53.448
1998	52.523
1999	51.694
2000	51.011
2001	50.676
2002	50.632
2003	50.947
2004	51.617
2005	52.61
2006	53.918
2007	55.732
2008	57.121
2009	58.279
2010	60.013
2011	60.53
2012	60.8
2013	61.996
2014	62.608
2015	63.818
2016	65.464
2017	66.753
2018	65.422
2019	65.464
2020	65.647
2021	61.141
2022	65.913