Year	Number of
1990	48590
1991	49430
1992	50260
1993	51100
1994	52090
1995	53580
1996	56230
1997	61040
1998	69320
1999	82250
2000	99760
2001	119500
2002	137600
2003	151600
2004	161200
2005	167300
2006	171200
2007	173700