Year	Number
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	-97065
1989	-130821
1990	12993
1991	14325
1992	15074
1993	15772
1994	16418
1995	17077
1996	17951
1997	48277
1998	64284
1999	70269
2000	74224
2001	77854
2002	82850
2003	91958
2004	110187
2005	132868
2006	153929
2007	167356
2008	165553
2009	139129
2010	299400
2011	194323
2012	125766
2013	65337
2014	-471614
2015	-160109
2016	-655870
2017	-672697
2018	-297041
2019	2048
2020	-74415
2021	-31885
2022	-30694
2023	-23291