Year	Number
1971	196
1972	445
1973	722
1974	1164
1975	2008
1976	2055
1977	2523
1978	2932
1979	3464
1980	3588
1981	3959
1982	4130
1983	4649
1984	5101
1985	5476
1986	6681
1987	7716
1988	8306
1989	8529
1990	8972
1991	9551
1992	10184
1993	10839
1994	11158
1995	11586
1996	11925
1998	12053
1999	12421
2000	12598
2001	13394
2002	14728
2003	15775
2017	37916
2018	28814
2019	28044
2020	28143
2021	25232
2022	28108