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| year | production | consumption |
| 1980 | 285,311.00 | 298,039.00 |
| 1981 | 294,556.00 | 303,441.00 |
| 1982 | 304,332.00 | 307,699.00 |
| 1983 | 305,804.00 | 313,647.00 |
| 1984 | 325,806.00 | 335,920.00 |
| 1985 | 343,291.00 | 348,264.00 |
| 1986 | 342,196.00 | 350,559.00 |
| 1987 | 339,450.00 | 350,955.00 |
| 1988 | 341,148.00 | 349,234.00 |
| 1989 | 331,117.00 | 341,933.00 |
| 1990 | 287,447.00 | 297,683.00 |
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