Year	Number
1961	128865
1962	136712
1963	145839
1964	156344
1965	161734
1966	166291
1967	171380
1968	173735
1969	173853
1970	174639
1971	173000
1972	172844
1973	178772
1974	182660
1975	185000
1976	182618
1977	191331
1978	189913
1979	189746
1980	189426
1981	181349
1982	183135
1983	176000
1984	169711
1985	166314
1986	168574
1987	164949
1988	167773
1989	165908
1990	162555
1991	160387
1992	155031
1993	154648
1994	146573
1995	151080
1996	139619
1997	141293
1998	130000
1999	129377
2000	123221
2001	121255
2002	119290
2003	117325
2004	115360
2005	113402