Year	Number of
1990	33460
1991	33220
1992	33180
1993	32780
1994	31890
1995	30440
1996	28710
1997	26280
1998	24120
1999	22160
2000	20280
2001	19000
2002	13580
2003	12900
2004	12480
2005	11740
2006	11190
2007	10700