Year	Number
1960	-14670
1961	-20021
1962	-19311
1963	-19200
1964	-19594
1965	-18433
1966	-19269
1967	-19339
1968	-20028
1969	-20376
1970	-27688
1971	-26339
1972	-40272
1973	-38506
1974	-42916
1975	-22893
1976	-13304
1977	-9655
1978	-9437
1979	-19356
1980	-23887
1981	-44200
1982	-46321
1983	-43970
1984	-40151
1985	-27786
1986	-25567
1987	-24743
1988	-13129
1989	-31969
1990	-6812
1991	-47938
1992	-213601
1993	-84279
1994	-134909
1995	-59568
1996	-45808
1997	-26648
1998	-25664
1999	-22043
2000	-34438
2001	-29506
2002	-32678
2003	-21074
2004	6060
2005	8326
2006	17764
2007	18745
2008	10697
2009	2655
2010	-58926
2011	-63837
2012	-25039
2013	-6879
2014	12468
2015	6383
2016	9139
2017	17375
2018	20725
2019	-51320
2020	-52671
2021	-18243
2022	-29227
2023	-29106