Year	Number
1960	-3332
1961	-3314
1962	-2146
1963	-3509
1964	-3942
1965	-7396
1966	-13906
1967	-15569
1968	-18979
1969	-20046
1970	-193005
1971	-80228
1972	-40775
1973	-42063
1974	-45233
1975	-47734
1976	-52762
1977	-55515
1978	-84697
1979	118325
1980	-134549
1981	62758
1982	18479
1983	42939
1984	-32601
1985	1557
1986	42051
1987	42576
1988	-16273
1989	53719
1990	56166
1991	58256
1992	272116
1993	187905
1994	10910
1995	-8706
1996	4674
1997	-4720
1998	12616
1999	-2813
2000	-4248
2001	-4005
2002	-3837
2003	-7286
2004	-5883
2005	-11435
2006	-10451
2007	-9890
2008	-34409
2009	-48418
2010	-43068
2011	-42942
2012	-43999
2013	-46754
2014	-48942
2015	-52272
2016	-40577
2017	-45720
2018	-51685
2019	-55607
2020	-22308
2021	-24262
2022	-29998
2023	-29998