Year	years
1960	46.603
1961	47.023
1962	47.354
1963	46.189
1964	49.457
1965	46.935
1966	44.626
1967	45.056
1968	45.456
1969	45.147
1970	45.534
1971	49.646
1972	49.925
1973	53.069
1974	53.23
1975	53.377
1976	53.462
1977	53.648
1978	53.44
1979	53.559
1980	53.934
1981	54.078
1982	54.321
1983	47.45
1984	46.22
1985	46.458
1986	51.481
1987	43.441
1988	35.923
1989	49.337
1990	49.732
1991	50.213
1992	45.891
1993	46.575
1994	56.644
1995	51.991
1996	52.276
1997	52.833
1998	48.81
1999	57.015
2000	58.319
2001	58.562
2002	58.976
2003	58.2
2004	56.773
2005	57.279
2006	60.281
2007	61.256
2008	61.206
2009	62.644
2010	63.016
2011	63.246
2012	63.792
2013	63.678
2014	64.269
2015	64.659
2016	64.78
2017	65.445
2018	65.681
2019	65.876
2020	65.614
2021	65.267
2022	65.578