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Loading...
| year | production | consumption |
| 1980 | .00 | 2.00 |
| 1981 | .00 | 2.00 |
| 1982 | .00 | 2.00 |
| 1983 | .00 | 2.00 |
| 1984 | .00 | 1.20 |
| 1985 | .00 | 1.60 |
| 1986 | .00 | 2.20 |
| 1987 | .00 | 4.00 |
| 1988 | .00 | 4.30 |
| 1989 | .00 | 4.80 |
| 1990 | .00 | 4.30 |
| 1991 | .00 | 4.60 |
| 1992 | .00 | 4.20 |
| 1993 | .00 | 4.40 |
| 1994 | .00 | 3.70 |
| 1995 | .00 | 1.80 |
| 1996 | .00 | 1.40 |
| 1997 | .00 | .70 |
| 1998 | .00 | .10 |
| 2001 | .00 | .10 |
| 2002 | .00 | .10 |
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