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| year | production | consumption |
| 1992 | 110.00 | 117.00 |
| 1993 | 96.00 | 95.00 |
| 1994 | 81.00 | 82.00 |
| 1995 | 83.00 | 80.00 |
| 1996 | 73.00 | 67.00 |
| 1997 | 64.00 | 58.00 |
| 1998 | 58.00 | 46.00 |
| 1999 | 41.00 | 38.00 |
| 2000 | 57.00 | 46.00 |
| 2001 | 61.00 | 44.00 |
| 2002 | 54.00 | 37.00 |
| 2003 | 50.00 | 38.00 |
| 2004 | 52.00 | 40.00 |
| 2005 | 63.00 | 50.00 |
| 2006 | 64.00 | 51.00 |
| 2007 | 57.00 | 48.00 |
| 2008 | 58.00 | 38.00 |
| 2009 | 63.00 | 23.00 |
| 2010 | 73.00 | 27.00 |
| 2011 | 82.00 | 30.00 |
| 2012 | 76.00 | 30.00 |
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