Year	Number of
1990	1608
1991	1490
1992	1404
1994	4704
1995	6606
1996	16650
1997	11320
1998	12410
1999	13940
2000	13130
2001	17070
2002	13090
2003	14660
2004	8189
2005	8739
2006	3631