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| year | production | consumption |
| 1986 | 21.00 | 16.00 |
| 1987 | 21.00 | 16.00 |
| 1988 | 7.50 | 22.00 |
| 1989 | 11.00 | 29.00 |
| 1990 | 11.00 | 30.00 |
| 1991 | 5.80 | 9.90 |
| 1992 | 13.00 | 12.00 |
| 1993 | 20.00 | 17.00 |
| 1994 | 20.00 | 6.10 |
| 1995 | 20.00 | 20.00 |
| 1996 | 20.00 | 17.00 |
| 1997 | 33.00 | 37.00 |
| 1998 | 33.00 | 31.00 |
| 1999 | 32.00 | 29.00 |
| 2000 | 33.00 | 22.00 |
| 2001 | 35.00 | 41.00 |
| 2002 | 38.00 | 25.00 |
| 2003 | 33.00 | 25.00 |
| 2004 | 4.20 | 21.00 |
| 2005 | 37.00 | 29.00 |
| 2006 | 33.00 | 50.00 |
| 2007 | 3.80 | 48.00 |
| 2008 | 5.10 | 49.00 |
| 2009 | 5.50 | 19.00 |
| 2010 | 9.20 | 48.00 |
| 2011 | 9.80 | 52.00 |
| 2012 | 11.00 | 55.00 |
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