Year	Number
1960	-1742
1961	-1775
1962	-1795
1963	-1778
1964	-1651
1965	-1456
1966	-1251
1967	-1116
1968	-1095
1969	-1095
1970	-1095
1971	-1095
1972	-1095
1973	-1102
1974	-1141
1975	-1206
1976	-1288
1977	-1386
1978	-1514
1979	-1757
1980	-2080
1981	-2418
1982	-2700
1983	-2882
1984	-3021
1985	-3146
1986	-3263
1987	-4709
1988	-8299
1989	-11360
1990	-15159
1991	-21384
1992	-34721
1993	-41843
1994	-44398
1995	-45172
1996	-46046
1997	-47259
1998	-47999
1999	-46434
2000	-41899
2001	-34968
2002	-28089
2003	-22605
2004	-20921
2005	-16816
2006	-12621
2007	-9625
2008	-8776
2009	-8487
2010	-8315
2011	-8135
2012	-7832
2013	-6151
2014	2288
2015	14740
2016	27063
2017	49359
2018	153372
2019	71801
2020	35894
2021	35894
2022	-20206
2023	-21525