Year	Number of
1980	742
1981	1214
1982	3716
1983	4156
1984	2776
1985	2648
1986	3120
1987	3473
1988	3878
1989	4363
1990	591
1991	618
1992	1179
1993	1976
1994	2992
1995	3615
1996	4469
1997	3417
1998	3863
1999	5023
2000	9239
2001	9735
2002	9888
2003	7782
2004	9729
2005	9853
2006	8478
2007	9002