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| year | production | consumption |
| 1992 | .00 | 84.00 |
| 1993 | 1.60 | 76.00 |
| 1994 | 2.90 | 78.00 |
| 1995 | 3.20 | 73.00 |
| 1996 | 3.00 | 66.00 |
| 1997 | 3.80 | 67.00 |
| 1998 | 5.50 | 71.00 |
| 1999 | 4.60 | 62.00 |
| 2000 | 6.00 | 57.00 |
| 2001 | 9.60 | 55.00 |
| 2002 | 8.80 | 53.00 |
| 2003 | 7.80 | 52.00 |
| 2004 | 6.10 | 55.00 |
| 2005 | 4.40 | 68.00 |
| 2006 | 3.70 | 73.00 |
| 2007 | 3.10 | 74.00 |
| 2008 | 3.00 | 68.00 |
| 2009 | 2.00 | 57.00 |
| 2010 | 2.00 | 55.00 |
| 2011 | 2.00 | 55.00 |
| 2012 | 2.00 | 56.00 |
| 2013 | 2.00 | 55.00 |
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