Year	Number of
1990	10750
1991	14360
1992	4995
1993	55330
1994	29590
1995	17600
1996	80000
1997	101900
1998	59700
1999	72640
2000	71400
2001	48240
2002	28860
2003	236800
2004	22400
2005	11240
2006	19000