Year	Number
1960	-8009
1961	-3575
1962	-3952
1963	-5999
1964	-23966
1965	-19961
1966	-11031
1967	1525
1968	2774
1969	-11049
1970	1134
1971	-13321
1972	-1997
1973	-1997
1974	22080
1975	26186
1976	29447
1977	31188
1978	30184
1979	-13801
1980	-8080
1981	-8286
1982	-8546
1983	-8730
1984	-8816
1985	-8816
1986	-8748
1987	-8623
1988	-8474
1989	-8298
1990	-8150
1991	1621
1992	7531
1993	8562
1994	3174
1995	-4376
1996	-7369
1997	-8176
1998	-8163
1999	-7686
2000	-6971
2001	-6239
2002	-5712
2003	-5487
2004	-5144
2005	-4662
2006	-4142
2007	-3676
2008	-3313
2009	-2821
2010	-2257
2011	-1760
2012	-1442
2013	-1395
2014	-1393
2015	-1393
2016	-1392
2017	-1398
2018	-1396
2019	-1395
2020	-1394
2021	-1395
2022	-1400
2023	-1400