Year	Number
1960	-3227
1961	-2807
1962	-2403
1963	-2016
1964	-1660
1965	-1327
1966	-1023
1967	-339
1968	-636
1969	-57
1970	-244
1971	-208
1972	-236
1973	-1066
1974	-744
1975	-553
1976	-5048
1977	-3907
1978	-22827
1979	-4818
1980	-15041
1981	-18901
1982	-889
1983	-481
1984	-267
1985	2090
1986	3953
1987	4559
1988	10916
1989	75072
1990	3969
1991	309
1992	2487
1993	5464
1994	5578
1995	5712
1996	5866
1997	6023
1998	6180
1999	6333
2000	5709
2001	2869
2002	-1913
2003	-6153
2004	-7192
2005	-8195
2006	-8792
2007	-8905
2008	-8775
2009	-8626
2010	-8518
2011	-8639
2012	-8596
2013	-8580
2014	-8607
2015	-8596
2016	-8596
2017	-8597
2018	-8596
2019	-8596
2020	-4301
2021	-4301
2022	-4061
2023	-3916