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| year | production | consumption |
| 1986 | 9.30 | 14.00 |
| 1987 | 9.90 | 24.00 |
| 1988 | 9.60 | 25.00 |
| 1989 | 10.00 | 27.00 |
| 1990 | 11.00 | 28.00 |
| 1991 | 12.00 | 28.00 |
| 1992 | 11.00 | 32.00 |
| 1993 | 13.00 | 37.00 |
| 1994 | 14.00 | 14.00 |
| 1995 | 15.00 | 16.00 |
| 1996 | 21.00 | 16.00 |
| 1997 | 15.00 | 29.00 |
| 1998 | 15.00 | 33.00 |
| 1999 | 15.00 | 40.00 |
| 2000 | 16.00 | 74.00 |
| 2001 | 16.00 | 78.00 |
| 2002 | 16.00 | 83.00 |
| 2003 | 23.00 | 64.00 |
| 2004 | 18.00 | 70.00 |
| 2005 | 21.00 | 76.00 |
| 2006 | 55.00 | 97.00 |
| 2007 | 18.00 | 125.00 |
| 2008 | 19.00 | 134.00 |
| 2009 | 17.00 | 141.00 |
| 2010 | 17.00 | 140.00 |
| 2011 | 17.00 | 139.00 |
| 2012 | 17.00 | 85.00 |
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