Year	Number
1960	-741
1961	-726
1962	-722
1963	-733
1964	-758
1965	-676
1966	-696
1967	63
1968	289
1969	349
1970	430
1971	526
1972	640
1973	769
1974	921
1975	1058
1976	1169
1977	1255
1978	1336
1979	1212
1980	566
1981	-660
1982	-1407
1983	-1270
1984	-1127
1985	-987
1986	-866
1987	-777
1988	-727
1989	-667
1990	-1194
1991	-1883
1992	-2423
1993	-2898
1994	-2873
1995	-2831
1996	-2765
1997	-2679
1998	-2584
1999	-3794
2000	-2971
2001	-2551
2002	-2502
2003	-3084
2004	-3103
2005	-2717
2006	-2681
2007	-2611
2008	-2550
2009	-2420
2010	-2294
2011	-2146
2012	-1970
2013	-1773
2014	-1569
2015	-1349
2016	-1136
2017	-2922
2018	-2919
2019	-2917
2020	-1772
2021	-1772
2022	-2000
2023	-2000