Year	Number of
1980	89800
1981	98530
1982	100900
1983	91570
1984	85670
1985	87170
1986	88790
1987	87420
1988	74460
1989	70010
1990	63900
1991	57860
1992	48070
1993	47000
1994	38160
1995	42120
1996	39320
1997	33220
1998	34660
1999	32080
2000	21780
2001	37270
2002	34970
2003	33840
2004	34390
2005	38290
2006	37860
2007	37550