Year	Number
1960	-51051
1961	-67204
1962	-78846
1963	-85474
1964	-88095
1965	-87226
1966	-82982
1967	-76028
1968	-66544
1969	-54901
1970	-41226
1971	-25879
1972	-12184
1973	-21
1974	11264
1975	21249
1976	30781
1977	38882
1978	45998
1979	52009
1980	56793
1981	58893
1982	61051
1983	62989
1984	65029
1985	66912
1986	68420
1987	70219
1988	71995
1989	73826
1990	74412
1991	74993
1992	73934
1993	73303
1994	71421
1995	69212
1996	65364
1997	60474
1998	54245
1999	46164
2000	35798
2001	24607
2002	15717
2003	7095
2004	-1102
2005	-7559
2006	-13700
2007	-18697
2008	-21969
2009	-23831
2010	-25002
2011	-26257
2012	-30036
2013	-31535
2014	-30228
2015	-29315
2016	-27234
2017	-25061
2018	-23600
2019	-21581
2020	-17853
2021	-14806
2022	5000
2023	5000