Year	Number
1960	-3148
1961	-3636
1962	-4025
1963	-4229
1964	-4356
1965	-4444
1966	-4507
1967	-4584
1968	-4679
1969	-4788
1970	-4913
1971	-5055
1972	-5223
1973	-5459
1974	-5870
1975	-6426
1976	-7066
1977	-7713
1978	-8460
1979	-9923
1980	-11766
1981	-13478
1982	-14580
1983	-15432
1984	-16620
1985	-17558
1986	-18299
1987	-18952
1988	-19567
1989	-20719
1990	-21915
1991	-22984
1992	-24002
1993	-24702
1994	-24528
1995	-23615
1996	-22473
1997	-21294
1998	-20022
1999	-18562
2000	-17675
2001	-16536
2002	-16253
2003	-15499
2004	-15173
2005	-14657
2006	-14110
2007	-13667
2008	-13417
2009	-13056
2010	-12592
2011	-12107
2012	-11688
2013	-11371
2014	-10972
2015	-10525
2016	-10071
2017	-9669
2018	-9345
2019	-8978
2020	-4666
2021	-4666
2022	-3000
2023	-3000