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| year | production | consumption |
| 1991 | 71.00 | 2,829.00 |
| 1992 | 63.00 | 2,841.00 |
| 1993 | 61.00 | 2,908.00 |
| 1994 | 58.00 | 2,883.00 |
| 1995 | 59.00 | 2,882.00 |
| 1996 | 60.00 | 2,922.00 |
| 1997 | 56.00 | 2,917.00 |
| 1998 | 59.00 | 2,923.00 |
| 1999 | 55.00 | 2,836.00 |
| 2000 | 64.00 | 2,767.00 |
| 2001 | 65.00 | 2,807.00 |
| 2002 | 69.00 | 2,710.00 |
| 2003 | 72.00 | 2,679.00 |
| 2004 | 68.00 | 2,648.00 |
| 2005 | 67.00 | 2,624.00 |
| 2006 | 68.00 | 2,636.00 |
| 2007 | 66.00 | 2,407.00 |
| 2008 | 60.00 | 2,533.00 |
| 2009 | 55.00 | 2,434.00 |
| 2010 | 49.00 | 2,467.00 |
| 2011 | 51.00 | 2,392.00 |
| 2012 | 51.00 | 2,389.00 |
| 2013 | 52.00 | 2,435.00 |
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