Year	years
1960	52.793
1961	53.718
1962	54.346
1963	54.941
1964	55.775
1965	56.382
1966	56.843
1967	57.017
1968	58.273
1969	59.279
1970	59.907
1971	60.554
1972	61.11
1973	58.48
1974	62.392
1975	62.971
1976	63.238
1977	63.15
1978	64.728
1979	64.894
1980	64.836
1981	62.193
1982	57.578
1983	66.315
1984	67.412
1985	67.397
1986	67.805
1987	67.796
1988	68.119
1989	68.166
1990	68.162
1991	68.182
1992	68.512
1993	68.411
1994	68.351
1995	68.594
1996	68.516
1997	68.444
1998	68.361
1999	68.398
2000	68.652
2001	69.536
2002	69.77
2003	70.123
2004	70.406
2005	70.633
2006	70.993
2007	71.214
2008	71.113
2009	71.329
2010	71.352
2011	70.546
2012	62.428
2013	58.832
2014	58.228
2015	60.566
2016	61.574
2017	62.957
2018	65.625
2019	68.224
2020	68.888
2021	69.058
2022	68.671