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| year | production | consumption |
| 1986 | 5.70 | 5.70 |
| 1987 | 6.00 | 8.50 |
| 1988 | 5.40 | 9.20 |
| 1989 | 5.20 | 10.00 |
| 1990 | 5.90 | 9.20 |
| 1991 | 6.00 | 8.20 |
| 1992 | 6.40 | 9.00 |
| 1993 | 6.20 | 8.10 |
| 1994 | 6.10 | 8.50 |
| 1995 | 6.20 | 8.60 |
| 1996 | 5.80 | 9.90 |
| 1997 | 6.40 | 10.00 |
| 1998 | 6.10 | 10.00 |
| 1999 | 4.50 | 12.00 |
| 2000 | 5.90 | 11.00 |
| 2001 | 5.80 | 12.00 |
| 2002 | 6.50 | 13.00 |
| 2003 | 6.20 | 13.00 |
| 2004 | 6.80 | 15.00 |
| 2005 | 6.90 | 14.00 |
| 2006 | 7.10 | 13.00 |
| 2007 | 6.40 | 9.70 |
| 2008 | 5.80 | 8.70 |
| 2009 | 5.30 | 7.80 |
| 2010 | 5.30 | 7.60 |
| 2011 | 6.30 | 9.60 |
| 2012 | 5.20 | 5.60 |
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