Year	Number
1960	-13235
1961	-10608
1962	-9259
1963	-8313
1964	-6094
1965	-1559
1966	-3307
1967	355
1968	-757
1969	-539
1970	1846
1971	-7285
1972	-2111
1973	-1089
1974	-4360
1975	-6677
1976	-15131
1977	2113
1978	351
1979	105
1980	5084
1981	-4859
1982	-3898
1983	1314
1984	-19303
1985	-30173
1986	-47064
1987	-72511
1988	-64324
1989	-39853
1990	-650
1991	17056
1992	84106
1993	-37782
1994	-27423
1995	-86300
1996	-92417
1997	-98574
1998	-108537
1999	-122704
2000	-147403
2001	-149185
2002	-160257
2003	-183002
2004	-212507
2005	-238799
2006	-271254
2007	-282748
2008	-294886
2009	-300762
2010	-293613
2011	-347554
2012	-371708
2013	-373065
2014	-310157
2015	-221059
2016	-98016
2017	-78062
2018	-81130
2019	-70597
2020	306664
2021	296541
2022	-62012
2023	-62012