Year	Number
1960	-13868
1961	-14858
1962	-15486
1963	-14361
1964	-6214
1965	6104
1966	18418
1967	26576
1968	26860
1969	20613
1970	10865
1971	482
1972	-7661
1973	-11555
1974	-14483
1975	-16973
1976	-18832
1977	-19856
1978	-19163
1979	-13519
1980	-4993
1981	3519
1982	9163
1983	9740
1984	7897
1985	1242
1986	-436
1987	848
1988	-29
1989	0
1990	59
1991	-72
1992	-132
1993	-291022
1994	88992
1995	57406
1996	40915
1997	11899
1998	12365
1999	11122
2000	4710
2001	-1711
2002	-5972
2003	-2797
2004	-1007
2005	-4438
2006	21722
2007	4811
2008	14304
2009	-1997
2010	-1972
2011	-1980
2012	-1992
2013	-1985
2014	-1985
2015	-1985
2016	-1988
2017	-1997
2018	-1997
2019	-1997
2020	-995
2021	-995
2022	-2000
2023	-2000