Year	Number of
1990	36790
1991	58000
1992	65670
1993	74820
1994	81050
1995	88760
1996	91790
1997	77300
1998	83030
1999	86090
2000	96620
2001	104600
2002	117500
2003	129200
2004	132400
2005	135800
2006	134600
2007	131600