Year	Number of
1990	26130
1991	25430
1992	24860
1993	23820
1994	22830
1995	21770
1996	21390
1997	21550
1998	21320
1999	20850
2000	19420
2001	18080
2002	16780
2003	15820
2004	14870
2005	13800
2006	12970
2007	12140