Year	years
1960	49.497
1961	50.26
1962	50.959
1963	51.551
1964	52.22
1965	52.808
1966	53.381
1967	53.932
1968	54.51
1969	55.017
1970	55.552
1971	56.259
1972	56.861
1973	57.535
1974	58.194
1975	59.069
1976	59.623
1977	60.346
1978	61.072
1979	61.586
1980	62.02
1981	62.461
1982	62.987
1983	63.124
1984	63.496
1985	63.924
1986	64.334
1987	64.836
1988	64.796
1989	65.678
1990	65.45
1991	64.933
1992	64.208
1993	63.411
1994	62.353
1995	61.108
1996	59.216
1997	57.887
1998	56.238
1999	55.188
2000	53.98
2001	53.042
2002	53.036
2003	52.74
2004	53.12
2005	53.672
2006	54.873
2007	56.201
2008	57.422
2009	58.395
2010	58.731
2011	59.502
2012	60.85
2013	62.029
2014	63.049
2015	64.03
2016	65.201
2017	65.88
2018	66.176
2019	66.637
2020	66.606
2021	62.985
2022	61.704