Year	Number
1960	83541
1961	85040
1962	89864
1963	93859
1964	97674
1965	102579
1966	100894
1967	104827
1968	104853
1969	76637
1970	19825
1971	-24759
1972	-18932
1973	-14649
1974	-14033
1975	-12192
1976	-15857
1977	3774
1978	-2313
1979	-2981
1980	4615
1981	-1224
1982	2273
1983	10256
1984	6529
1985	4937
1986	79751
1987	80549
1988	88799
1989	-75336
1990	-108425
1991	-104305
1992	-221599
1993	-292647
1994	-520043
1995	-412725
1996	-427681
1997	-436232
1998	-448726
1999	-165312
2000	-43423
2001	-28743
2002	-13939
2003	-3565
2004	9413
2005	22958
2006	34582
2007	13172
2008	2198
2009	8215
2010	23234
2011	14829
2012	9046
2013	8121
2014	-6299
2015	-12253
2016	-7445
2017	-15903
2018	-31760
2019	-37080
2020	-12432
2021	-18917
2022	0
2023	0