Year	Number
1960	3717
1961	4665
1962	-9628
1963	-9175
1964	-9212
1965	-9248
1966	-9277
1967	-9304
1968	-9443
1969	-9161
1970	-5293
1971	-3628
1972	-3782
1973	-4057
1974	-4496
1975	-4945
1976	-4919
1977	-5041
1978	-5165
1979	-5142
1980	-6420
1981	-6829
1982	-7022
1983	-7322
1984	-7276
1985	-6829
1986	-6853
1987	-7012
1988	-7201
1989	-7923
1990	-10132
1991	-526
1992	-983
1993	-602
1994	-699
1995	-591
1996	-157
1997	45
1998	-186
1999	-102
2000	-1135
2001	-791
2002	-571
2003	-325
2004	-225
2005	-219
2006	-26
2007	363
2008	761
2009	1148
2010	-1558
2011	-1855
2012	2629
2013	1279
2014	1058
2015	2637
2016	3682
2017	3542
2018	3752
2019	3378
2020	1746
2021	1746
2022	425001
2023	-112067