Year	years
1960	39.21
1961	40.986
1962	42.656
1963	44.205
1964	45.965
1965	47.403
1966	48.824
1967	50.032
1968	51.242
1969	52.644
1970	53.756
1971	54.904
1972	56.023
1973	56.807
1974	58.132
1975	59.115
1976	60.263
1977	60.85
1978	61.517
1979	62.103
1980	62.635
1981	63.064
1982	63.417
1983	64.069
1984	64.659
1985	65.031
1986	65.645
1987	65.975
1988	66.534
1989	66.812
1990	67.372
1991	67.715
1992	68.288
1993	68.524
1994	68.705
1995	69.25
1996	69.487
1997	69.342
1998	69.189
1999	69.287
2000	68.816
2001	68.912
2002	68.962
2003	69.145
2004	69.46
2005	69.545
2006	69.658
2007	69.819
2008	70.07
2009	70.186
2010	70.182
2011	66.833
2012	69.774
2013	69.983
2014	68.237
2015	68.5
2016	68.501
2017	69.63
2018	70.017
2019	69.496
2020	69.867
2021	69.63
2022	69.736