Year	Number
1960	12176
1961	-48780
1962	-48017
1963	-46510
1964	-43475
1965	-38520
1966	-38136
1967	-35668
1968	-36684
1969	-28746
1970	-10239
1971	-12234
1972	-4596
1973	-1169
1974	-1197
1975	-290
1976	-2533
1977	15245
1978	18037
1979	20291
1980	-13567
1981	-12300
1982	7862
1983	15279
1984	-105676
1985	-106911
1986	-98157
1987	-84713
1988	-64855
1989	-52328
1990	-46822
1991	-57922
1992	-47772
1993	-49825
1994	-47170
1995	-42594
1996	-37148
1997	-15423
1998	-17583
1999	-17306
2000	-4208
2001	36057
2002	40580
2003	28764
2004	34434
2005	21273
2006	28539
2007	32815
2008	30509
2009	22415
2010	-3724
2011	-733
2012	1008
2013	-2388
2014	-6316
2015	-13308
2016	7014
2017	-4914
2018	-19374
2019	-21860
2020	-297
2021	-11253
2022	-9999
2023	-9999