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| year | production | consumption |
| 1980 | 55.00 | 112.00 |
| 1981 | 53.00 | 100.00 |
| 1982 | 53.00 | 103.00 |
| 1983 | 61.00 | 99.00 |
| 1984 | 64.00 | 99.00 |
| 1985 | 61.00 | 107.00 |
| 1986 | 68.00 | 107.00 |
| 1987 | 65.00 | 106.00 |
| 1988 | 66.00 | 100.00 |
| 1989 | 70.00 | 94.00 |
| 1990 | 67.00 | 92.00 |
| 1991 | 76.00 | 96.00 |
| 1992 | 82.00 | 93.00 |
| 1993 | 80.00 | 92.00 |
| 1994 | 84.00 | 94.00 |
| 1995 | 88.00 | 97.00 |
| 1996 | 93.00 | 99.00 |
| 1997 | 76.00 | 95.00 |
| 1998 | 70.00 | 97.00 |
| 1999 | 69.00 | 93.00 |
| 2000 | 68.00 | 87.00 |
| 2001 | 64.00 | 88.00 |
| 2002 | 64.00 | 86.00 |
| 2003 | 71.00 | 86.00 |
| 2004 | 69.00 | 85.00 |
| 2005 | 66.00 | 83.00 |
| 2006 | 67.00 | 85.00 |
| 2007 | 65.00 | 86.00 |
| 2008 | 63.00 | 87.00 |
| 2009 | 68.00 | 85.00 |
| 2010 | 62.00 | 86.00 |
| 2011 | 58.00 | 84.00 |
| 2012 | 69.00 | 81.00 |
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