Year	Number
1960	-66870
1961	-66880
1962	-66783
1963	-65956
1964	-64952
1965	-54215
1966	-27390
1967	-19162
1968	-9852
1969	-10056
1970	-10062
1971	-9950
1972	-9787
1973	-9607
1974	-9256
1975	-8762
1976	-11064
1977	-12574
1978	-12406
1979	-12117
1980	-11505
1981	-10778
1982	-10563
1983	-5791
1984	5894
1985	5148
1986	6143
1987	6607
1988	7003
1989	7272
1990	7453
1991	7712
1992	8000
1993	5978
1994	594
1995	-10177
1996	-12610
1997	-13789
1998	-15073
1999	-16316
2000	-17475
2001	-18429
2002	-19029
2003	-20774
2004	-24512
2005	-29303
2006	-29586
2007	-29009
2008	-28334
2009	-27364
2010	-25953
2011	11481
2012	-29555
2013	-27026
2014	-26591
2015	-25230
2016	-23826
2017	-22368
2018	-21013
2019	-19609
2020	-9189
2021	-9189
2022	-4000
2023	-4000