Year	Number
1970	83600
1971	96500
1972	110700
1973	120900
1974	126900
1975	137700
1976	141700
1977	149700
1978	150000
1979	167800
1980	171100
1981	158800
1982	161100
1983	169400
1984	177100
1985	190500
1986	229900
1987	233300
1988	222600
1989	221400
1990	233500
1991	228000
1992	253700
1993	249800
1994	259200
1995	266500
1996	279500
1997	301500
1998	305100
1999	334500
2000	320753
2001	306511
2002	270045
2003	248403
2004	254045