Year	Number
1960	-17662
1961	-18224
1962	-18971
1963	-21220
1964	-31125
1965	-36419
1966	-47780
1967	-55265
1968	-54963
1969	-45586
1970	-31405
1971	-17235
1972	-7848
1973	-6736
1974	-8670
1975	-11596
1976	-14515
1977	-16444
1978	-16654
1979	-16058
1980	-15067
1981	-13892
1982	-9799
1983	684
1984	9108
1985	-31640
1986	-21071
1987	50702
1988	-3008
1989	-3026
1990	-476
1991	2116
1992	4411
1993	5975
1994	7434
1995	8763
1996	9810
1997	10417
1998	-13145
1999	-13857
2000	-11501
2001	-25657
2002	-35034
2003	-35960
2004	-32854
2005	-28157
2006	-23450
2007	-20334
2008	-23981
2009	-25908
2010	-26350
2011	-26662
2012	-26918
2013	-26976
2014	-27076
2015	-22904
2016	-22774
2017	-25452
2018	-25137
2019	-24737
2020	-12369
2021	-12369
2022	-5000
2023	-5000