Year	Number of
1990	12750
1991	12540
1992	12580
1993	12360
1994	11950
1995	11210
1996	11500
1997	11910
1998	12250
1999	10980
2000	9597
2001	8909
2002	8888
2003	8937
2004	9215
2005	9499
2006	9729
2007	9961