Year	Number of
1990	0
1991	27
1992	30
1993	32
1994	35
1995	108
1996	557
1997	1405
1998	2316
1999	2931
2000	3702
2001	4590
2002	5546
2003	6476
2004	7394
2005	8715
2006	9093
2007	9491