Year	Number of
1990	1382
1991	1882
1992	2468
1993	3089
1994	3650
1995	4069
1996	4414
1997	4641
1998	4789
1999	4833
2000	4772
2001	4614
2002	4367
2003	4043
2004	3673
2005	3312
2006	3022
2007	2780