Year	Number
1960	-1446
1961	-821
1962	-2054
1963	-342
1964	-751
1965	-1057
1966	-645
1967	255
1968	-922
1969	164
1970	583
1971	1235
1972	818
1973	289
1974	474
1975	1861
1976	1225
1977	384
1978	1338
1979	4787
1980	-18988
1981	-18148
1982	-17999
1983	-17700
1984	-17752
1985	-16765
1986	-16940
1987	-16603
1988	-16466
1989	-17359
1990	17545
1991	19281
1992	17604
1993	17225
1994	17065
1995	16934
1996	16527
1997	16324
1998	15643
1999	14610
2000	15478
2001	9927
2002	2412
2003	14182
2004	16803
2005	16615
2006	20926
2007	14398
2008	16664
2009	19182
2010	11394
2011	889
2012	16048
2013	5296
2014	11571
2015	14166
2016	-982
2017	18044
2018	31976
2019	33559
2020	9042
2021	19870
2022	616038
2023	-156677