Year	Number of
1990	17200
1991	16220
1992	15450
1993	14510
1994	13940
1995	13290
1996	12880
1997	11990
1998	12010
1999	11060
2000	10960
2001	10700
2002	10760
2003	10500
2004	10450
2005	10440
2006	10390
2007	10320