Year	Number
1960	-2274
1961	-2418
1962	1277
1963	4768
1964	3117
1965	10295
1966	19045
1967	21563
1968	-7099
1969	5671
1970	10360
1971	31810
1972	36197
1973	34319
1974	-16505
1975	-24472
1976	7566
1977	12630
1978	-8381
1979	-2011
1980	9591
1981	28738
1982	-23114
1983	-1899
1984	2780
1985	5834
1986	6758
1987	1839
1988	14505
1989	47276
1990	59606
1991	77195
1992	71035
1993	33610
1994	2844
1995	1447
1996	3969
1997	1459
1998	8493
1999	19768
2000	17531
2001	39173
2002	37429
2003	44003
2004	54907
2005	50282
2006	25420
2007	23729
2008	25499
2009	17121
2010	22786
2011	31665
2012	44891
2013	56494
2014	74263
2015	115125
2016	66282
2017	45573
2018	35404
2019	41105
2020	20314
2021	20314
2022	19999
2023	19999