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Loading...
| year | production | consumption |
| 1980 | 2.00 | 2.00 |
| 1981 | 2.00 | 2.00 |
| 1982 | 1.00 | 1.00 |
| 1983 | 1.00 | 1.00 |
| 1984 | .70 | .80 |
| 1985 | .70 | .70 |
| 1986 | .60 | .70 |
| 1987 | .70 | .70 |
| 1988 | .50 | .60 |
| 1989 | .60 | .60 |
| 1990 | .50 | .60 |
| 1991 | .50 | .50 |
| 1992 | .50 | .50 |
| 1993 | .20 | .40 |
| 1994 | .50 | .40 |
| 1995 | .40 | .30 |
| 1996 | .30 | .30 |
| 1997 | .70 | .60 |
| 1998 | .70 | .60 |
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