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| year | production | consumption |
| 1980 | 8.64 | 8.64 |
| 1981 | 8.87 | 8.87 |
| 1982 | 8.79 | 8.79 |
| 1983 | 8.86 | 8.86 |
| 1984 | 9.56 | 9.56 |
| 1985 | 10.00 | 10.00 |
| 1986 | 11.28 | 11.28 |
| 1987 | 13.76 | 13.76 |
| 1988 | 13.62 | 13.62 |
| 1989 | 14.15 | 14.15 |
| 1990 | 14.94 | 14.94 |
| 1991 | 21.22 | 21.22 |
| 1992 | 30.01 | 30.01 |
| 1993 | 32.95 | 32.95 |
| 1994 | 36.55 | 36.55 |
| 1995 | 40.46 | 40.46 |
| 1996 | 42.74 | 42.74 |
| 1997 | 50.57 | 50.57 |
| 1998 | 59.84 | 59.84 |
| 1999 | 64.73 | 64.73 |
| 2000 | 77.93 | 77.93 |
| 2001 | 86.99 | 86.99 |
| 2002 | 102.65 | 102.65 |
| 2003 | 118.23 | 118.23 |
| 2004 | 142.58 | 142.58 |
| 2005 | 163.57 | 163.57 |
| 2006 | 186.86 | 186.86 |
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