Year	Number of
1980	5412
1981	5322
1982	5181
1983	5028
1984	4472
1985	4852
1986	4522
1987	4125
1988	4016
1989	3769
1990	3588
1991	3658
1992	3960
1993	4209
1994	4163
1995	4339
1996	4403
1997	4240
1998	3999
1999	3532
2000	3073
2001	2923
2002	2720
2003	2507
2004	2251
2005	1808
2006	1687
2007	1540