Year	Number
1971	20396
1973	33198
1974	34349
1975	12886
1976	9434
1979	3626
1980	9123
1981	10384
1982	15066
1983	16018
1984	24402
1985	25725
1986	23518
1987	22240
1988	19714
1989	18804
1990	17416
1991	19532
1992	21947
1993	24545
1994	25238
1995	43754
1996	41398
1997	44624
1998	43278
1999	44070
2000	47841
2001	8088
2003	16588
2004	13978
2005	8489
2006	7176
2011	30270
2012	27116
2018	3085
2019	3645
2020	8118
2021	5729
2022	4640