Year	Number of
1990	10780
1991	11150
1992	13420
1993	16270
1994	19950
1995	23880
1996	28270
1997	33970
1998	39740
1999	45310
2000	49450
2001	51320
2002	54300
2003	58300
2004	60840
2005	57800
2006	54310
2007	53230