Year Number 1961 5239829 1962 5288419 1963 5323003 1964 5360633 1965 5386950 1966 6067990 1967 6047214 1968 5986877 1969 5901686 1970 5866478 1971 5831294 1972 5810168 1973 5795867 1974 5772368 1975 5745876 1976 5724515 1977 5695658 1978 5645933 1979 5537137 1980 5383440 1981 5354646 1982 5341040 1983 5357040 1984 5376040 1985 5384040 1986 5458118 1987 5531248 1988 5304840 1989 5258042 1990 5176746 1991 5099999 1992 5034954 1993 5043022 1994 5051087 1995 5059154 1996 5068557 1997 5085290 1998 5133750 1999 5183165 2000 5232625 2001 5280606 2002 5325195 2003 5284778 2004 5244367 2005 5203955 2006 5163541