Year	Number
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	-1314
1969	-2701
1970	-2149
1971	-716
1972	51
1973	1625
1974	3815
1975	5145
1976	8189
1977	19634
1978	36219
1979	46380
1980	51087
1981	55952
1982	60243
1983	64017
1984	68301
1985	70875
1986	61049
1987	269431
1988	201016
1989	180037
1990	71114
1991	15292
1992	37143
1993	-284877
1994	-505381
1995	-66368
1996	-66214
1997	-61647
1998	-39492
1999	-34028
2000	-29032
2001	-28658
2002	-30010
2003	-31699
2004	-32211
2005	-31428
2006	-29400
2007	-22662
2008	-9242
2009	-8588
2010	-9321
2011	-12133
2012	-13506
2013	-12899
2014	-10309
2015	-6449
2016	-5498
2017	-4795
2018	-3706
2019	-2228
2020	-1775
2021	-1775
2022	-6000
2023	-6000