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| year | production | consumption |
| 1992 | .00 | 57.00 |
| 1993 | .00 | 28.00 |
| 1994 | .00 | 25.00 |
| 1995 | .00 | 39.00 |
| 1996 | .00 | 35.00 |
| 1997 | .00 | 46.00 |
| 1998 | .00 | 46.00 |
| 1999 | .00 | 46.00 |
| 2000 | .00 | 57.00 |
| 2001 | .00 | 60.00 |
| 2002 | .00 | 60.00 |
| 2003 | .00 | 64.00 |
| 2004 | .00 | 67.00 |
| 2005 | .00 | 69.00 |
| 2006 | .00 | 67.00 |
| 2007 | .00 | 58.00 |
| 2008 | .00 | 45.00 |
| 2009 | .00 | 55.00 |
| 2010 | .00 | 54.00 |
| 2011 | .00 | 54.00 |
| 2012 | .00 | 52.00 |
| 2013 | .00 | 50.00 |
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