Year	Number of
1988	3446
1989	4913
1990	4650
1991	6844
1992	10110
1993	11080
1994	11510
1995	14430
1996	14360
1997	12010
1998	12380
1999	13080
2000	13650
2001	13030
2002	11680
2003	10410
2004	10020
2005	9063
2006	8468
2007	8427