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| year | production | consumption |
| 1986 | 8.20 | 8.20 |
| 1987 | 8.40 | 8.40 |
| 1988 | 7.90 | 7.90 |
| 1989 | 8.40 | 8.10 |
| 1990 | 9.30 | 8.40 |
| 1991 | 10.00 | 10.00 |
| 1992 | 10.00 | 9.80 |
| 1993 | 10.00 | 9.50 |
| 1994 | 11.00 | 11.00 |
| 1995 | 11.00 | 11.00 |
| 1996 | 12.00 | 12.00 |
| 1997 | 12.00 | 12.00 |
| 1998 | 12.00 | 12.00 |
| 1999 | 13.00 | 13.00 |
| 2000 | 14.00 | 14.00 |
| 2001 | 15.00 | 15.00 |
| 2002 | 15.00 | 15.00 |
| 2003 | 14.00 | 16.00 |
| 2004 | 13.00 | 16.00 |
| 2005 | 14.00 | 16.00 |
| 2006 | 15.00 | 17.00 |
| 2007 | 16.00 | 22.00 |
| 2008 | 18.00 | 21.00 |
| 2009 | 18.00 | 24.00 |
| 2010 | 16.00 | 25.00 |
| 2011 | 16.00 | 26.00 |
| 2012 | 17.00 | 26.00 |
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