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| year | production | consumption |
| 1993 | 2.10 | 154.00 |
| 1994 | 2.40 | 159.00 |
| 1995 | 3.00 | 169.00 |
| 1996 | 4.20 | 173.00 |
| 1997 | 3.30 | 169.00 |
| 1998 | 3.60 | 175.00 |
| 1999 | 3.90 | 174.00 |
| 2000 | 3.60 | 170.00 |
| 2001 | 3.70 | 179.00 |
| 2002 | 5.30 | 176.00 |
| 2003 | 6.50 | 188.00 |
| 2004 | 6.10 | 206.00 |
| 2005 | 6.20 | 213.00 |
| 2006 | 5.30 | 211.00 |
| 2007 | 5.00 | 211.00 |
| 2008 | 4.90 | 215.00 |
| 2009 | 4.30 | 205.00 |
| 2010 | 3.60 | 201.00 |
| 2011 | 3.10 | 197.00 |
| 2012 | 3.00 | 194.00 |
| 2013 | 3.00 | 187.00 |
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