Year	Number of
1990	1126
1991	2306
1992	4615
1993	8829
1994	16000
1995	25840
1996	36810
1997	46980
1998	53840
1999	54070
2000	55100
2001	50700
2002	47340
2003	41540
2004	35690
2005	33220
2006	31150
2007	29510