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| year | production | consumption |
| 1992 | .00 | 725.00 |
| 1993 | .00 | 649.00 |
| 1994 | .00 | 531.00 |
| 1995 | .00 | 410.00 |
| 1996 | .00 | 373.00 |
| 1997 | .00 | 289.00 |
| 1998 | .00 | 245.00 |
| 1999 | .00 | 196.00 |
| 2000 | .00 | 144.00 |
| 2001 | .00 | 129.00 |
| 2002 | .00 | 233.00 |
| 2003 | .00 | 299.00 |
| 2004 | .00 | 291.00 |
| 2005 | .00 | 316.00 |
| 2006 | .00 | 440.00 |
| 2007 | .00 | 418.00 |
| 2008 | .00 | 357.00 |
| 2009 | .00 | 267.00 |
| 2010 | .00 | 331.00 |
| 2011 | .00 | 367.00 |
| 2012 | .00 | 345.00 |
| 2013 | .00 | 394.00 |
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