Year	Number of
1990	22860
1991	29140
1992	23230
1993	16380
1994	9442
1995	9718
1996	6628
1997	8957
1998	8498
1999	9699
2000	7616
2001	146400
2002	133400
2003	196600
2004	140700
2005	178100
2006	154800