Year	Number of
1990	182300
1991	175200
1992	170500
1993	167200
1994	165300
1995	163900
1996	165500
1997	164100
1998	152200
1999	138700
2000	135600
2001	119000
2002	121500
2003	117200
2004	117900
2005	116100
2006	119700
2007	122800