Year	Number of
1990	5053
1991	5541
1992	5922
1993	6402
1994	6922
1995	7526
1996	12190
1997	13490
1998	11150
1999	17000
2000	10030
2001	11630
2002	13530
2003	17550
2004	16840
2005	17400
2006	18860
2007	18290