Year	years
1960	36.292
1961	36.778
1962	37.183
1963	37.724
1964	38.228
1965	38.733
1966	39.103
1967	39.696
1968	40.142
1969	40.639
1970	41.143
1971	41.702
1972	42.345
1973	42.799
1974	43.51
1975	43.989
1976	44.592
1977	44.841
1978	45.071
1979	46.064
1980	46.673
1981	47.121
1982	47.926
1983	48.433
1984	49.055
1985	49.805
1986	50.329
1987	51.102
1988	51.618
1989	52.303
1990	53.059
1991	54.08
1992	55.011
1993	55.935
1994	56.842
1995	57.676
1996	58.193
1997	58.266
1998	58.792
1999	59.083
2000	59.017
2001	59.078
2002	58.951
2003	59.206
2004	59.627
2005	60.002
2006	60.533
2007	60.569
2008	61.112
2009	61.64
2010	61.642
2011	62.547
2012	63.347
2013	63.082
2014	63.475
2015	63.583
2016	64.264
2017	64.284
2018	64.251
2019	65.186
2020	64.235
2021	63.529
2022	64.344