Year	Number of
1990	40120
1991	39010
1992	37600
1993	36100
1994	34810
1995	33920
1996	29300
1997	28590
1998	29510
1999	29480
2000	29240
2001	28930
2002	29300
2003	27920
2004	26600
2005	26640
2006	28770
2007	30650