Year	Number of
1990	23040
1991	25050
1992	25900
1993	26580
1994	27030
1995	27700
1996	28290
1997	30600
1998	32000
1999	33900
2000	36180
2001	39140
2002	39920
2003	38690
2004	39710
2005	37990
2006	36610
2007	36090