Year	Number
1960	2191
1961	3901
1962	4379
1963	4260
1964	4499
1965	6367
1966	2816
1967	4501
1968	2782
1969	2487
1970	4467
1971	-3573
1972	2243
1973	5788
1974	100318
1975	105500
1976	104615
1977	129474
1978	134773
1979	140384
1980	151287
1981	147787
1982	83392
1983	-54326
1984	-188903
1985	-207483
1986	-224853
1987	-223978
1988	-219374
1989	-224983
1990	-227157
1991	-254515
1992	-248714
1993	-87480
1994	-70382
1995	-71692
1996	-56798
1997	-47334
1998	-48202
1999	-58808
2000	-80698
2001	-136249
2002	-159912
2003	-149595
2004	-86754
2005	-10644
2006	-12376
2007	-13752
2008	-72121
2009	-79473
2010	-331713
2011	-337194
2012	-221502
2013	-185339
2014	85052
2015	49080
2016	97646
2017	189497
2018	74198
2019	-29450
2020	86
2021	-15223
2022	-9999
2023	-9999