|
| year | production | consumption |
| 1980 | 86.00 | 301.00 |
| 1981 | 86.00 | 285.40 |
| 1982 | 87.00 | 285.60 |
| 1983 | 83.00 | 267.00 |
| 1984 | 80.00 | 325.00 |
| 1985 | 86.00 | 330.65 |
| 1986 | 84.00 | 304.25 |
| 1987 | 79.00 | 313.50 |
| 1988 | 75.00 | 316.40 |
| 1989 | 70.00 | 309.87 |
| 1990 | 63.90 | 317.15 |
| 1991 | 60.00 | 251.17 |
| 1992 | | |
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| 1994 | | |
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| 1997 | | |
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