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| year | production | consumption |
| 1980 | 5.51 | 5.51 |
| 1981 | 6.05 | 6.05 |
| 1982 | 5.16 | 5.16 |
| 1983 | 6.46 | 6.46 |
| 1984 | 8.64 | 8.64 |
| 1985 | 10.72 | 10.72 |
| 1986 | 11.50 | 11.50 |
| 1987 | 12.27 | 12.27 |
| 1988 | 11.98 | 11.98 |
| 1989 | 57.19 | 57.19 |
| 1990 | 67.99 | 67.99 |
| 1991 | 73.52 | 73.52 |
| 1992 | 77.49 | 77.49 |
| 1993 | 79.70 | 79.70 |
| 1994 | 80.20 | 80.20 |
| 1995 | 78.07 | 78.07 |
| 1996 | 79.37 | 79.37 |
| 1997 | 80.79 | 80.79 |
| 1998 | 80.66 | 80.66 |
| 1999 | 83.45 | 83.45 |
| 2000 | 85.70 | 85.70 |
| 2001 | 82.67 | 82.67 |
| 2002 | 92.64 | 92.64 |
| 2003 | 93.53 | 93.53 |
| 2004 | 97.09 | 97.09 |
| 2005 | 99.68 | 99.68 |
| 2006 | 110.40 | 110.40 |
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