Year	Number
1971	10318
1972	10898
1974	10385
1976	10995
1977	5907
1979	5025
1982	4704
1991	3651
1992	4287
1993	4513
1995	3852
1996	5419
2003	5012
2009	2212
2020	7652
2021	7923