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| year | production | consumption |
| 1986 | .00 | 7.90 |
| 1987 | 8.50 | 10.00 |
| 1988 | 8.50 | 8.60 |
| 1989 | 8.90 | 8.90 |
| 1990 | 9.20 | 9.20 |
| 1991 | 8.20 | 9.00 |
| 1992 | 9.40 | 9.40 |
| 1993 | 9.30 | 9.40 |
| 1994 | 9.60 | 9.60 |
| 1995 | 8.50 | 8.50 |
| 1996 | 8.20 | 8.20 |
| 1997 | 9.60 | 9.60 |
| 1998 | 9.70 | 9.00 |
| 1999 | 9.40 | 9.30 |
| 2000 | 8.90 | 9.30 |
| 2001 | 8.00 | 9.40 |
| 2002 | 8.80 | 9.00 |
| 2003 | 3.10 | 8.80 |
| 2004 | 6.00 | 9.10 |
| 2005 | 8.70 | 9.10 |
| 2006 | 8.70 | 9.40 |
| 2007 | 8.50 | 9.70 |
| 2008 | 9.40 | 11.00 |
| 2009 | 7.30 | 12.00 |
| 2010 | 7.70 | 13.00 |
| 2011 | 9.70 | 13.00 |
| 2012 | 9.50 | 13.00 |
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