Year	Number of
1990	4047
1991	3892
1992	4203
1993	4398
1994	4536
1995	4423
1996	4342
1997	4235
1998	4109
1999	2963
2000	2825
2001	2691
2002	2681
2003	2618
2004	2720
2005	2744
2006	2867
2007	2930