Year	Number of
1990	16410
1991	17600
1992	17390
1993	17740
1994	18760
1995	20120
1996	21380
1997	22060
1998	27360
1999	26920
2000	30320
2001	35710
2002	40970
2003	45120
2004	48350
2005	51420
2006	53660
2007	55040