Year	years
1960	42.371
1961	42.783
1962	42.986
1963	43.075
1964	43.09
1965	43.119
1966	43.157
1967	43.156
1968	43.162
1969	43.176
1970	43.238
1971	43.233
1972	43.357
1973	43.429
1974	43.494
1975	43.785
1976	43.878
1977	43.989
1978	44.084
1979	44.044
1980	44.153
1981	41.961
1982	42.169
1983	42.275
1984	42.21
1985	42.535
1986	44.833
1987	45.104
1988	45.678
1989	45.951
1990	46.264
1991	46.472
1992	46.721
1993	47.013
1994	47.134
1995	47.579
1996	48.142
1997	48.999
1998	49.607
1999	50.407
2000	51.11
2001	51.602
2002	52.181
2003	52.305
2004	52.636
2005	52.89
2006	53.273
2007	53.993
2008	54.692
2009	55.282
2010	55.837
2011	56.584
2012	57.521
2013	58.523
2014	59.439
2015	60.44
2016	61.475
2017	62.221
2018	63.234
2019	63.92
2020	64.16
2021	62.432
2022	62.688