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| year | production | consumption |
| 1992 | 79.00 | 91.00 |
| 1993 | 68.00 | 85.00 |
| 1994 | 53.00 | 55.00 |
| 1995 | 51.00 | 52.00 |
| 1996 | 54.00 | 51.00 |
| 1997 | 52.00 | 46.00 |
| 1998 | 45.00 | 45.00 |
| 1999 | 30.00 | 31.00 |
| 2000 | 38.00 | 46.00 |
| 2001 | 37.00 | 45.00 |
| 2002 | 40.00 | 48.00 |
| 2003 | 37.00 | 44.00 |
| 2004 | 45.00 | 56.00 |
| 2005 | 52.00 | 63.00 |
| 2006 | 55.00 | 64.00 |
| 2007 | 62.00 | 73.00 |
| 2008 | 59.00 | 70.00 |
| 2009 | 61.00 | 78.00 |
| 2010 | 68.00 | 81.00 |
| 2011 | 65.00 | 85.00 |
| 2012 | 67.00 | 89.00 |
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