Year	Number
1960	1059
1961	1247
1962	1371
1963	1376
1964	1308
1965	1194
1966	1073
1967	1007
1968	1017
1969	1208
1970	1487
1971	1770
1972	1964
1973	1995
1974	1995
1975	1995
1976	1995
1977	1995
1978	1995
1979	1995
1980	1995
1981	1995
1982	1995
1983	1854
1984	785
1985	-1086
1986	-1086
1987	-3609
1988	-3608
1989	-7336
1990	-12442
1991	-328546
1992	-22331
1993	33686
1994	-25840
1995	136103
1996	-52425
1997	-30772
1998	-32003
1999	-3770
2000	-33196
2001	41755
2002	-6571
2003	76703
2004	-6376
2005	-12841
2006	-50036
2007	-18156
2008	17859
2009	-24355
2010	-13369
2011	-32992
2012	-43335
2013	-34025
2014	-75830
2015	-53049
2016	-55530
2017	-38636
2018	-21435
2019	-29849
2020	-14987
2021	-14988
2022	-17152
2023	-15297