Year	years
1960	43.1
1961	43.4
1962	43.791
1963	44.077
1964	44.366
1965	44.712
1966	45.118
1967	45.419
1968	45.796
1969	46.215
1970	46.597
1971	47.061
1972	47.497
1973	47.975
1974	48.446
1975	48.826
1976	49.264
1977	49.734
1978	50.181
1979	50.665
1980	51.181
1981	51.619
1982	52.053
1983	52.405
1984	52.971
1985	53.446
1986	53.929
1987	54.492
1988	55.156
1989	55.772
1990	56.422
1991	57.097
1992	57.629
1993	58.418
1994	58.989
1995	59.534
1996	60.084
1997	60.752
1998	61.332
1999	61.871
2000	62.346
2001	62.843
2002	63.306
2003	63.635
2004	64.004
2005	64.386
2006	64.779
2007	65.027
2008	65.446
2009	65.88
2010	66.162
2011	66.534
2012	66.705
2013	67.021
2014	67.163
2015	67.318
2016	67.628
2017	67.701
2018	67.748
2019	67.841
2020	64.467
2021	63.63
2022	64.928