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| year | production | consumption |
| 1986 | 19.00 | 25.00 |
| 1987 | 19.00 | 25.00 |
| 1988 | 17.00 | 23.00 |
| 1989 | 17.00 | 23.00 |
| 1990 | 20.00 | 26.00 |
| 1991 | 22.00 | 27.00 |
| 1992 | 19.00 | 27.00 |
| 1993 | 18.00 | 27.00 |
| 1994 | 16.00 | 22.00 |
| 1995 | 13.00 | 19.00 |
| 1996 | 8.90 | 14.00 |
| 1997 | 8.70 | 12.00 |
| 1998 | 17.00 | 7.90 |
| 1999 | 16.00 | 21.00 |
| 2000 | 20.00 | 26.00 |
| 2001 | 4.20 | 5.80 |
| 2002 | 4.20 | 5.80 |
| 2003 | 4.10 | 5.80 |
| 2004 | 4.10 | 5.70 |
| 2005 | 3.50 | 4.80 |
| 2006 | 2.70 | 3.70 |
| 2007 | 3.20 | 4.40 |
| 2008 | 3.30 | 4.50 |
| 2009 | 2.50 | 3.40 |
| 2010 | 3.90 | 4.70 |
| 2011 | 3.80 | 4.80 |
| 2012 | 3.80 | 4.80 |
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