Year	Number of
1990	1141
1991	2337
1992	4677
1993	8947
1994	16210
1995	26460
1996	37870
1997	47310
1998	53550
1999	56490
2000	57680
2001	57710
2002	57380
2003	57000
2004	55880
2005	54500
2006	52950
2007	51530