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| year | production | consumption |
| 1986 | 8.30 | 50.00 |
| 1987 | 11.00 | 50.00 |
| 1988 | 6.40 | 50.00 |
| 1989 | 5.50 | 50.00 |
| 1990 | 6.80 | 50.00 |
| 1991 | 11.00 | 50.00 |
| 1992 | 20.00 | 50.00 |
| 1993 | 19.00 | 50.00 |
| 1994 | 12.00 | 50.00 |
| 1995 | 5.00 | 50.00 |
| 1996 | 21.00 | 50.00 |
| 1997 | 20.00 | 50.00 |
| 1998 | 24.00 | 50.00 |
| 1999 | 24.00 | 24.00 |
| 2000 | 22.00 | 25.00 |
| 2001 | 33.00 | 54.00 |
| 2002 | 6.50 | 47.00 |
| 2003 | .00 | 46.00 |
| 2004 | .00 | 50.00 |
| 2005 | .00 | 49.00 |
| 2007 | .00 | 48.00 |
| 2008 | .00 | 9.20 |
| 2009 | .00 | 51.00 |
| 2010 | .00 | 67.00 |
| 2011 | .00 | 67.00 |
| 2012 | .00 | 72.00 |
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