Year	Number of
1980	112300
1981	116800
1982	104700
1983	106300
1984	151900
1985	151000
1986	153100
1987	163700
1988	183100
1989	217300
1990	317000
1991	207400
1992	236200
1993	178100
1994	180000
1995	119200
1996	165500
1997	195800
1998	162400
1999	145800
2000	119900
2001	107100
2002	118400
2003	132800
2004	130500
2005	137100
2006	147300
2007	140600