Year	Number of
1990	41710
1991	57830
1992	57560
1993	41870
1994	22060
1995	24180
1996	20270
1997	32100
1998	47690
1999	45100
2000	53310
2001	35820
2002	35480
2003	31120
2004	28940
2005	39570
2006	31090