Year	Number
1960	-1158
1961	-904
1962	-909
1963	-856
1964	-830
1965	-784
1966	-709
1967	-617
1968	-496
1969	-427
1970	-283
1971	-432
1972	-517
1973	-528
1974	-474
1975	-396
1976	-306
1977	-258
1978	-278
1979	-483
1980	-775
1981	-1062
1982	-1206
1983	-1206
1984	-1051
1985	-821
1986	-603
1987	-472
1988	-469
1989	-559
1990	-724
1991	-1121
1992	-1175
1993	-1261
1994	-1376
1995	-1494
1996	-1625
1997	-1801
1998	-2024
1999	-2274
2000	-2512
2001	-1292
2002	-739
2003	-889
2004	-991
2005	-1023
2006	-1072
2007	-1086
2008	-1176
2009	-1306
2010	-1527
2011	-1641
2012	-1736
2013	-1781
2014	-1794
2015	-1800
2016	-1786
2017	-1775
2018	-1758
2019	-1718
2020	0
2021	-792
2022	-600
2023	-600