Year	Number
1960	1891
1961	2124
1962	2189
1963	2167
1964	2189
1965	2435
1966	1964
1967	2180
1968	1973
1969	1991
1970	2294
1971	1305
1972	2022
1973	2283
1974	2094
1975	2038
1976	1259
1977	3548
1978	3492
1979	3492
1980	4012
1981	2755
1982	2536
1983	7864
1984	7518
1985	7482
1986	6536
1987	6832
1988	7738
1989	8153
1990	-712546
1991	78052
1992	56210
1993	7300
1994	-121407
1995	54372
1996	-37922
1997	281480
1998	99203
1999	53643
2000	-2060
2001	7142
2002	-23110
2003	-103564
2004	-1001
2005	101019
2006	77946
2007	65306
2008	17405
2009	1193
2010	2848
2011	91983
2012	-25708
2013	-21995
2014	-26692
2015	-15195
2016	-26822
2017	-24830
2018	-23226
2019	-19697
2020	-10119
2021	-11862
2022	-5000
2023	-5000