Year	years
1960	43.355
1961	44.18
1962	45.009
1963	46.318
1964	47.36
1965	48.462
1966	49.972
1967	51.16
1968	52.281
1969	53.276
1970	54.57
1971	52.15
1972	55.146
1973	55.546
1974	55.607
1975	56.175
1976	56.517
1977	56.857
1978	57.398
1979	58.084
1980	58.642
1981	59.301
1982	59.802
1983	60.499
1984	61.01
1985	60.403
1986	60.252
1987	59.782
1988	60.377
1989	60.731
1990	61.409
1991	61.331
1992	60.733
1993	60.369
1994	60.634
1995	60.391
1996	61.062
1997	61.486
1998	62.112
1999	62.755
2000	63.124
2001	63.575
2002	63.65
2003	63.967
2004	64.409
2005	63.967
2006	65.653
2007	66.103
2008	66.5
2009	66.531
2010	66.889
2011	67.066
2012	67.194
2013	67.616
2014	67.718
2015	68.169
2016	68.325
2017	68.816
2018	68.959
2019	69.096
2020	68.825
2021	68.623
2022	68.918