Year	Number
1960	18909
1961	56098
1962	68068
1963	70976
1964	74419
1965	80687
1966	75469
1967	80165
1968	77095
1969	71155
1970	61524
1971	32976
1972	38121
1973	41090
1974	38493
1975	38750
1976	27255
1977	63715
1978	62116
1979	56298
1980	52736
1981	28782
1982	37693
1983	57416
1984	73562
1985	123316
1986	243491
1987	266936
1988	288713
1989	299676
1990	231224
1991	12361
1992	-85560
1993	-96947
1994	-76997
1995	-98300
1996	-85040
1997	-56052
1998	-59065
1999	-77647
2000	-80388
2001	-29826
2002	50323
2003	65721
2004	58977
2005	31424
2006	33357
2007	36414
2008	36948
2009	41532
2010	68599
2011	65295
2012	68846
2013	63794
2014	290874
2015	644996
2016	-866101
2017	-10681
2018	27265
2019	22728
2020	30852
2021	10934
2022	58496
2023	58496