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| year | production | consumption |
| 1986 | 62.00 | 106.00 |
| 1987 | 63.00 | 105.00 |
| 1988 | 71.00 | 109.00 |
| 1989 | 76.00 | 113.00 |
| 1990 | 73.00 | 112.00 |
| 1991 | 70.00 | 106.00 |
| 1992 | 44.00 | 90.00 |
| 1993 | 44.00 | 89.00 |
| 1994 | 42.00 | 86.00 |
| 1995 | 46.00 | 87.00 |
| 1996 | 42.00 | 79.00 |
| 1997 | 18.00 | 75.00 |
| 1998 | 9.90 | 95.00 |
| 1999 | 11.00 | 97.00 |
| 2000 | 15.00 | 93.00 |
| 2001 | 17.00 | 95.00 |
| 2002 | 15.00 | 107.00 |
| 2003 | 19.00 | 108.00 |
| 2004 | 16.00 | 94.00 |
| 2005 | 16.00 | 93.00 |
| 2006 | 17.00 | 42.00 |
| 2007 | 18.00 | 43.00 |
| 2008 | 49.00 | 88.00 |
| 2009 | 49.00 | 49.00 |
| 2010 | 46.00 | 61.00 |
| 2011 | 44.00 | 52.00 |
| 2012 | 43.00 | 49.00 |
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