Year	Number of
1990	17200
1991	27530
1992	30960
1993	34560
1994	36350
1995	38420
1996	38170
1997	39000
1998	39840
1999	39530
2000	41390
2001	43640
2002	46680
2003	47670
2004	46170
2005	44220
2006	41680
2007	39380