Year	Number of
1990	2282
1991	4674
1992	9353
1993	17890
1994	32420
1995	52910
1996	75730
1997	94620
1998	107100
1999	113000
2000	115400
2001	115400
2002	114800
2003	114000
2004	111800
2005	109000
2006	105900
2007	103100