Year	Number of
1990	15670
1991	9962
1992	19620
1993	18380
1994	10030
1995	18750
1996	21010
1997	20630
1998	40800
1999	13170
2000	6608
2001	3074
2002	2612
2003	1724
2004	1232
2005	1059
2006	1278