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| year | production | consumption |
| 1992 | 28.00 | 18.00 |
| 1993 | 26.00 | 19.00 |
| 1994 | 28.00 | 21.00 |
| 1995 | 37.00 | 29.00 |
| 1996 | 30.00 | 24.00 |
| 1997 | 31.00 | 25.00 |
| 1998 | 31.00 | 25.00 |
| 1999 | 34.00 | 27.00 |
| 2000 | 34.00 | 28.00 |
| 2001 | 34.00 | 29.00 |
| 2002 | 34.00 | 32.00 |
| 2003 | 38.00 | 32.00 |
| 2004 | 36.00 | 35.00 |
| 2005 | 36.00 | 35.00 |
| 2006 | 32.00 | 37.00 |
| 2007 | 34.00 | 38.00 |
| 2008 | 29.00 | 38.00 |
| 2009 | 30.00 | 37.00 |
| 2010 | 27.00 | 35.00 |
| 2011 | 23.00 | 34.00 |
| 2012 | 26.00 | 32.00 |
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