Year	Number of
1990	9590
1991	11360
1992	13570
1993	15480
1994	17230
1995	18880
1996	20020
1997	21330
1998	22150
1999	23470
2000	23940
2001	25450
2002	26140
2003	27490
2004	26720
2005	25680
2006	24350
2007	22960