| 1995 |
$ 1,230,000,000 |
| 1960 |
$ 2,525,000,000 |
| 1970 |
$ 3,440,000,000 |
| 1975 |
$ 4,800,000,000 |
| 1977 |
$ 5,920,000,000 |
| 1978 |
$ 6,690,000,000 |
| 1979 |
$ 7,500,000,000 |
| 1980 |
$ 7,370,000,000 |
| 1981 |
$ 8,250,000,000 |
| 1982 |
$ 8,100,000,000 |
| 1983 |
$ 9,375,000,000 |
| 1984 |
$ 12,340,000,000 |
| 1985 |
$ 13,284,000,000 |
| 1986 |
$ 14,479,000,000 |
| 1987 |
$ 16,500,000,000 |
| 1988 |
$ 17,927,000,000 |
| 1989 |
$ 17,143,000,000 |
| 1990 |
$ 13,730,903,000 |
| 1991 |
$ 10,564,458,000 |
| 1992 |
$ 10,317,250,000 |
| 1993 |
$ 11,254,041,000 |
| 1994 |
$ 14,070,599,000 |
| 1995 |
$ 17,226,203,000 |
| 1996 |
$ 17,752,671,000 |
| 1997 |
$ 19,344,470,000 |
| 1998 |
$ 19,148,369,000 |
| 1999 |
$ 21,736,092,000 |
| 2000 |
$ 25,025,479,000 |
| 2001 |
$ 25,593,409,000 |
|
