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| year | production | consumption |
| 1986 | 49.00 | 61.00 |
| 1987 | 58.00 | 80.00 |
| 1988 | 59.00 | 78.00 |
| 1989 | 63.00 | 92.00 |
| 1990 | 75.00 | 86.00 |
| 1991 | 69.00 | 82.00 |
| 1992 | 78.00 | 99.00 |
| 1993 | 81.00 | 88.00 |
| 1994 | 72.00 | 94.00 |
| 1995 | 80.00 | 105.00 |
| 1996 | 130.00 | 112.00 |
| 1997 | 130.00 | 129.00 |
| 1998 | 116.00 | 130.00 |
| 1999 | 113.00 | 116.00 |
| 2000 | 104.00 | 92.00 |
| 2001 | 92.00 | 87.00 |
| 2002 | 75.00 | 75.00 |
| 2003 | 74.00 | 69.00 |
| 2004 | 67.00 | 74.00 |
| 2005 | 67.00 | 61.00 |
| 2006 | 61.00 | 51.00 |
| 2007 | 58.00 | 52.00 |
| 2008 | 44.00 | 44.00 |
| 2009 | 31.00 | 42.00 |
| 2010 | 37.00 | 46.00 |
| 2011 | 38.00 | 34.00 |
| 2012 | 33.00 | 34.00 |
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