Year	Number of
1990	28210
1991	26860
1992	25580
1993	24360
1994	23210
1995	22110
1996	21070
1997	20080
1998	19120
1999	18180
2000	17250
2001	16320
2002	15420
2003	14540
2004	13720
2005	12960
2006	12260
2007	11600