Year	Number
1960	-44466
1961	-31580
1962	-29193
1963	-28745
1964	-26306
1965	-20420
1966	-23534
1967	-19162
1968	-19182
1969	-15875
1970	-5468
1971	11749
1972	39407
1973	50018
1974	55981
1975	64299
1976	64050
1977	99519
1978	104611
1979	89893
1980	-122726
1981	-18371
1982	-34299
1983	-29916
1984	-23223
1985	-39678
1986	-106376
1987	-423368
1988	-259989
1989	-170957
1990	-97330
1991	-95107
1992	-110878
1993	158569
1994	502417
1995	72493
1996	66949
1997	-55158
1998	-54854
1999	-62292
2000	-58468
2001	-51429
2002	-44909
2003	-48338
2004	-40129
2005	-52323
2006	-48812
2007	-44273
2008	-62180
2009	-60999
2010	-29343
2011	-8820
2012	10389
2013	22477
2014	31611
2015	30414
2016	77168
2017	14804
2018	-12765
2019	-17639
2020	11745
2021	-9515
2022	-5000
2023	-5000