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Loading...
| year | production | consumption |
| 1980 | 7.62 | 7.62 |
| 1981 | 8.76 | 8.76 |
| 1982 | 8.47 | 8.47 |
| 1983 | 9.79 | 9.79 |
| 1984 | 12.28 | 12.28 |
| 1985 | 13.96 | 13.96 |
| 1986 | 16.68 | 16.68 |
| 1987 | 18.80 | 18.80 |
| 1988 | 19.01 | 19.01 |
| 1989 | 65.18 | 65.18 |
| 1990 | 76.56 | 76.56 |
| 1991 | 82.42 | 82.42 |
| 1992 | 87.19 | 87.19 |
| 1993 | 89.82 | 89.82 |
| 1994 | 90.96 | 90.96 |
| 1995 | 88.81 | 88.81 |
| 1996 | 90.35 | 90.35 |
| 1997 | 92.51 | 92.51 |
| 1998 | 93.26 | 93.26 |
| 1999 | 97.25 | 97.25 |
| 2000 | 99.73 | 99.73 |
| 2001 | 96.88 | 96.88 |
| 2002 | 107.15 | 107.15 |
| 2003 | 111.17 | 111.17 |
| 2004 | 114.95 | 114.95 |
| 2005 | 119.60 | 119.60 |
| 2006 | 130.18 | 130.18 |
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