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Loading...
| year | production | consumption |
| 1980 | .01 | .01 |
| 1981 | .01 | .01 |
| 1982 | .01 | .01 |
| 1983 | .01 | .01 |
| 1984 | .01 | .01 |
| 1985 | .01 | .01 |
| 1986 | .01 | .01 |
| 1987 | .01 | .01 |
| 1988 | .01 | .01 |
| 1989 | .00 | .00 |
| 1990 | .00 | .00 |
| 1991 | .01 | .01 |
| 1992 | .00 | .00 |
| 1993 | .00 | .00 |
| 1994 | .33 | .33 |
| 1995 | .46 | .46 |
| 1996 | .52 | .52 |
| 1997 | .60 | .60 |
| 1998 | .65 | .65 |
| 1999 | .86 | .86 |
| 2000 | 1.12 | 1.12 |
| 2001 | 1.13 | 1.13 |
| 2002 | 1.36 | 1.36 |
| 2003 | 1.44 | 1.44 |
| 2004 | 1.46 | 1.46 |
| 2005 | 1.35 | 1.35 |
| 2006 | 1.48 | 1.48 |
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