Year	Number
1960	-361
1961	-685
1962	-714
1963	-735
1964	-546
1965	-553
1966	-514
1967	-438
1968	-340
1969	-244
1970	-862
1971	-1203
1972	-1422
1973	-1430
1974	-1335
1975	-1203
1976	-1063
1977	-945
1978	-890
1979	-848
1980	-828
1981	-811
1982	-793
1983	-759
1984	-1208
1985	-1302
1986	-1224
1987	-1231
1988	-1224
1989	-1181
1990	-1145
1991	223
1992	405
1993	484
1994	513
1995	528
1996	478
1997	493
1998	465
1999	390
2000	271
2001	148
2002	51
2003	41
2004	101
2005	202
2006	314
2007	372
2008	369
2009	338
2010	295
2011	247
2012	203
2013	156
2014	108
2015	60
2016	16
2017	0
2018	0
2019	0
2020	0
2021	0
2022	0
2023	0