Year Total 1960 2004000000 1961 2204000000 1962 2414000000 1963 2408000000 1964 2421000000 1965 2623000000 1966 2894000000 1967 3190000000 1968 3480000000 1969 3793000000 1970 4145000000 1971 4531000000 1972 5006000000 1973 5482000000 1974 6128000000 1975 6948000000 1976 7919000000 1977 8523000000 1978 9179000000 1979 9913000000 1980 10720000000 1981 12170000000 1982 12630000000 1983 11940000000 1984 14150000000 1985 14930000000 1986 15650000000 1987 17070000000 1988 17830000000 1989 18800000000 1990 20220000000 1991 20210000000 1992 18950000000 1993 18210000000 1994 18210000000 1995 18080000000 1996 19230000000 1997 19770000000 1998 20320000000 1999 20800000000 2000 21040000000 2001 21380000000 2002 21660000000 2003 24860000000 2004 25480000000 2005 25260000000 2006 26470000000 2007 26370000000 2008 27120000000