Year	Number
1960	-14647
1961	15090
1962	-15378
1963	-11519
1964	29635
1965	-13952
1966	5261
1967	-9820
1968	-5928
1969	-25319
1970	-6348
1971	-7580
1972	-118665
1973	2839
1974	10072
1975	-20706
1976	-12871
1977	1890
1978	8248
1979	-40170
1980	149360
1981	-58722
1982	-3837
1983	-41786
1984	-29572
1985	-66680
1986	-55836
1987	-21213
1988	-46546
1989	-43635
1990	-39996
1991	-39298
1992	35771
1993	-686089
1994	516369
1995	-84698
1996	-226350
1997	-84365
1998	13841
1999	-34507
2000	-40114
2001	9965
2002	-16881
2003	36721
2004	47090
2005	17913
2006	15322
2007	22120
2008	79323
2009	184361
2010	11847
2011	-19517
2012	22613
2013	-2295
2014	-6856
2015	-236447
2016	-109490
2017	-68450
2018	68145
2019	14241
2020	-10186
2021	-14415
2022	2000
2023	2000