Year	Number
1960	-4329
1961	-4162
1962	-4026
1963	-3998
1964	-4123
1965	-14195
1966	-14483
1967	-14700
1968	-14874
1969	-14995
1970	-12728
1971	-3088
1972	6914
1973	10892
1974	11307
1975	11741
1976	12202
1977	12631
1978	12920
1979	12991
1980	12064
1981	8632
1982	2402
1983	2387
1984	2805
1985	3298
1986	3755
1987	4088
1988	4231
1989	4219
1990	4144
1991	4166
1992	7113
1993	7343
1994	7567
1995	7808
1996	7999
1997	8146
1998	8203
1999	8177
2000	7970
2001	7418
2002	4964
2003	4758
2004	4758
2005	4771
2006	4798
2007	4834
2008	4820
2009	4349
2010	3562
2011	1301
2012	488
2013	471
2014	1138
2015	2145
2016	3129
2017	3761
2018	3819
2019	2933
2020	1816
2021	1816
2022	3000
2023	3000