Year	Number
1961	82300
1962	91400
1963	113600
1964	121400
1965	126900
1966	131450
1967	137500
1968	143500
1969	151800
1970	155000
1971	160000
1972	165000
1973	170000
1974	175000
1975	178000
1976	192000
1977	197000
1978	201000
1979	204000
1980	212000
1981	218000
1982	227000
1983	234000
1984	230000
1985	226500
1986	223000
1987	219000
1988	215000
1989	211600
1990	207952
1991	205300
1992	202700
1993	200064
1994	197400
1995	194772
1996	190000
1997	185000
1998	180200
1999	175300
2000	170441
2001	171000
2002	172400
2003	173300
2004	174000
2005	175232