Year	Number
1960	-2082
1961	-2271
1962	-2389
1963	-2357
1964	-2049
1965	-1582
1966	-1558
1967	-2078
1968	-2743
1969	-2913
1970	-3059
1971	-3181
1972	-3250
1973	-3289
1974	-3296
1975	-3224
1976	-2980
1977	-2988
1978	-2439
1979	-2649
1980	-2808
1981	-7809
1982	-2887
1983	-2850
1984	-2884
1985	1790
1986	1353
1987	2417
1988	14879
1989	-7701
1990	7169
1991	7496
1992	6012
1993	-6692
1994	-48259
1995	-2501
1996	-2949
1997	-5749
1998	-6058
1999	-6575
2000	-6689
2001	-6832
2002	-7036
2003	-7327
2004	-7656
2005	-8000
2006	-8136
2007	-7997
2008	-10009
2009	-10223
2010	-10467
2011	-10654
2012	-10706
2013	-10662
2014	-10586
2015	-10464
2016	-10295
2017	-10127
2018	-9956
2019	-9796
2020	-4897
2021	-4897
2022	-5733
2023	-5268