Year	Number
1992	53833
1993	51900
1994	50000
1995	49966
1996	48000
1997	46000
1998	44000
1999	42132
2000	41854
2001	41025
2002	40195
2003	39900
2004	39600
2005	39313
2006	38200
2007	37000
2008	35984