Year	Number of
1990	26240
1991	26320
1992	27020
1993	26500
1994	26630
1995	26470
1996	31530
1997	28830
1998	27620
1999	25810
2000	23910
2001	23000
2002	22210
2003	21440
2004	20640
2005	20110
2006	20360
2007	20070