Year	Number
1971	5000
1972	7009
1973	4785
1974	6669
1975	6201
1976	6629
1977	6685
1978	5458
1984	4104
1992	5845
2000	4576
2008	8114
2009	7966
2010	7841
2011	7973
2012	7907
2014	7752
2015	7797
2017	7577
2018	7574