Year	Number
1971	9647
1972	10094
1974	10318
1976	10962
1977	5518
1979	4918
1982	3991
1991	3032
1992	3569
1993	4271
1995	3787
1996	5528
2003	4249
2009	1842
2020	7554
2021	7854