Year	Number of
1990	273900
1991	198400
1992	168400
1993	115200
1994	102100
1995	82740
1996	87620
1997	97540
1998	131100
1999	125400
2000	81690
2001	63530
2002	44560
2003	37360
2004	26690
2005	29780
2006	30290