Year	Number of
1990	33230
1991	32890
1992	32520
1993	32130
1994	31720
1995	31290
1996	29140
1997	29500
1998	29560
1999	28210
2000	28130
2001	27720
2002	25730
2003	27140
2004	26970
2005	25930
2006	25300
2007	24960