Year	Number
1960	193
1961	193
1962	193
1963	-88
1964	-88
1965	-88
1966	-88
1967	-192
1968	-192
1969	-192
1970	-192
1971	-485
1972	-485
1973	-485
1974	-485
1975	-753
1976	-753
1977	-753
1978	-291
1979	-291
1980	-291
1981	-291
1982	-291
1983	-291
1984	-291
1985	-291
1986	-291
1987	-291
1988	-995
1989	-995
1990	-995
1991	-995
1992	235
1993	284
1994	-470
1995	-2425
1996	-2604
1997	-2735
1998	-2815
1999	-2995
2000	-2688
2001	-2733
2002	-2816
2003	-2974
2004	-3038
2005	-3055
2006	-3133
2007	-3123
2008	-3069
2009	-2971
2010	-1799
2011	-1719
2012	-1633
2013	-1561
2014	-1482
2015	-1415
2016	-1348
2017	-1283
2018	-1283
2019	-1283
2020	-635
2021	-635
2022	-600
2023	-600