Year	years
1960	47.178
1961	47.664
1962	47.991
1963	44.072
1964	48.238
1965	48.282
1966	48.166
1967	48.094
1968	47.745
1969	47.398
1970	47.153
1971	46.829
1972	46.498
1973	45.905
1974	45.304
1975	44.698
1976	44.647
1977	44.797
1978	45.48
1979	46.659
1980	47.963
1981	49.422
1982	50.692
1983	51.319
1984	51.64
1985	51.734
1986	51.638
1987	51.477
1988	50.976
1989	50.22
1990	48.431
1991	46.519
1992	44.319
1993	42.166
1994	14.098
1995	39.969
1996	40.698
1997	40.64
1998	41.681
1999	44.616
2000	47.129
2001	49.021
2002	51.032
2003	53.368
2004	55.491
2005	57.316
2006	58.714
2007	59.965
2008	61.134
2009	61.958
2010	62.54
2011	63.261
2012	64.009
2013	64.426
2014	64.94
2015	65.298
2016	65.737
2017	65.941
2018	66.251
2019	66.437
2020	66.774
2021	66.072
2022	67.129