Year	Number
1960	-260
1961	-93
1962	-97
1963	-96
1964	-97
1965	-90
1966	-42
1967	-124
1968	-69
1969	-77
1970	-308
1971	-399
1972	-405
1973	-415
1974	-376
1975	-249
1976	-267
1977	-282
1978	-294
1979	-307
1980	115
1981	292
1982	317
1983	343
1984	347
1985	351
1986	355
1987	354
1988	355
1989	342
1990	-251
1991	-505
1992	-516
1993	-522
1994	-476
1995	-419
1996	-385
1997	-405
1998	-451
1999	-452
2000	-1158
2001	-1503
2002	-1583
2003	-1647
2004	-1701
2005	-1697
2006	-1661
2007	-1618
2008	-1586
2009	-1527
2010	-1475
2011	-1509
2012	-1538
2013	-1575
2014	-1602
2015	-1629
2016	-1641
2017	-1652
2018	-1652
2019	-1650
2020	-1636
2021	-1646
2022	-810
2023	-790