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Loading...
| year | production | consumption |
| 1980 | 5.00 | 5.00 |
| 1981 | 4.00 | 4.00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | .30 | .20 |
| 1985 | .30 | .20 |
| 1986 | .30 | .20 |
| 1988 | .00 | .20 |
| 1989 | .00 | .20 |
| 1992 | .30 | .20 |
| 1993 | .30 | .30 |
| 1994 | .20 | .10 |
| 1995 | .80 | .90 |
| 1996 | .20 | .70 |
| 1997 | .30 | 1.60 |
| 1998 | .30 | 1.30 |
| 1999 | .10 | 1.10 |
| 2002 | .20 | .30 |
| 2003 | .20 | .20 |
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