Year	Number of
1990	47540
1991	46070
1992	45530
1993	44080
1994	41960
1995	38750
1996	39750
1997	41180
1998	42360
1999	37980
2000	33190
2001	30810
2002	30740
2003	30680
2004	31560
2005	32310
2006	23400
2007	25190