Year	Number
1960	-322
1961	-336
1962	-347
1963	-369
1964	-397
1965	-438
1966	-477
1967	-521
1968	-575
1969	-698
1970	-864
1971	-1019
1972	-1148
1973	-1209
1974	-1325
1975	-1477
1976	-1655
1977	-2998
1978	-2998
1979	-2997
1980	-2997
1981	-2998
1982	-2998
1983	-2998
1984	-2998
1985	-2998
1986	-2998
1987	-2997
1988	-2997
1989	-17967
1990	-3002
1991	-2998
1992	34504
1993	6215
1994	5305
1995	-22996
1996	-28880
1997	-8191
1998	-8513
1999	-2998
2000	-2997
2001	-21099
2002	-18933
2003	-19137
2004	-19075
2005	-18723
2006	-18058
2007	-17078
2008	-8361
2009	-2553
2010	3637
2011	9340
2012	14070
2013	-2987
2014	-2984
2015	-3018
2016	-3009
2017	-3001
2018	-2987
2019	-3018
2020	-1494
2021	-1494
2022	3000
2023	3000