|
| year | production | consumption |
| 1980 | 284,503.30 | 296,752.10 |
| 1981 | 294,023.90 | 303,080.50 |
| 1982 | 304,279.80 | 309,555.50 |
| 1983 | 306,407.30 | 312,280.40 |
| 1984 | 326,660.10 | 332,736.00 |
| 1985 | 344,093.10 | 346,788.30 |
| 1986 | 343,105.40 | 349,571.60 |
| 1987 | 340,587.80 | 350,139.30 |
| 1988 | 342,062.70 | 348,809.90 |
| 1989 | 331,859.70 | 340,356.30 |
| 1990 | 308,647.20 | 321,263.10 |
| 1991 | | |
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