Year	Number of
1990	208
1991	444
1992	867
1993	1546
1994	2449
1995	3442
1996	4333
1997	5253
1998	6199
1999	7194
2000	7835
2001	8296
2002	8933
2003	9347
2004	9545
2005	9558
2006	9608
2007	9653