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| year | production | consumption |
| 1980 | .97 | .97 |
| 1981 | 1.03 | 1.03 |
| 1982 | .25 | .25 |
| 1983 | .22 | .22 |
| 1984 | .02 | .02 |
| 1985 | .42 | .42 |
| 1986 | .53 | .53 |
| 1987 | .67 | .67 |
| 1988 | .81 | .81 |
| 1989 | .88 | .88 |
| 1990 | 1.01 | 1.01 |
| 1991 | 1.15 | 1.15 |
| 1992 | 1.23 | 1.23 |
| 1993 | 1.42 | 1.42 |
| 1994 | 1.59 | 1.59 |
| 1995 | 1.99 | 1.99 |
| 1996 | 2.72 | 2.72 |
| 1997 | 2.97 | 2.97 |
| 1998 | 3.41 | 3.41 |
| 1999 | 3.65 | 3.65 |
| 2000 | 4.14 | 4.14 |
| 2001 | 4.34 | 4.34 |
| 2002 | 5.07 | 5.07 |
| 2003 | 5.22 | 5.22 |
| 2004 | 6.44 | 6.44 |
| 2005 | 8.64 | 8.64 |
| 2006 | 9.07 | 9.07 |
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