Year	Number of
1990	9558
1991	10390
1992	10870
1993	11420
1994	11960
1995	12600
1996	9545
1997	14310
1998	15540
1999	17000
2000	18730
2001	19460
2002	18710
2003	22970
2004	23680
2005	21250
2006	18620
2007	18460