Year	Number
1960	-3528
1961	-2947
1962	-2658
1963	-2480
1964	-2308
1965	-1851
1966	-2911
1967	-2819
1968	-3743
1969	-4485
1970	-4957
1971	-8162
1972	-8267
1973	-9322
1974	-11473
1975	-13058
1976	-15686
1977	-12399
1978	-13073
1979	-13095
1980	-11641
1981	-12699
1982	-11379
1983	-8783
1984	-8708
1985	-7873
1986	7992
1987	9558
1988	9470
1989	-5079
1990	131587
1991	-238965
1992	-129565
1993	-95476
1994	-77371
1995	-112857
1996	-52110
1997	-48437
1998	-76766
1999	-84926
2000	83013
2001	227791
2002	86578
2003	69185
2004	23897
2005	-1805
2006	-34052
2007	-6042
2008	1182
2009	18145
2010	7983
2011	6895
2012	988
2013	2773
2014	485
2015	-356
2016	4657
2017	1234
2018	-2741
2019	-2238
2020	1292
2021	-1544
2022	-4000
2023	-4000