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| year | production | consumption |
| 1986 | .00 | 42.00 |
| 1987 | .00 | 42.00 |
| 1988 | .00 | 43.00 |
| 1989 | .00 | 36.00 |
| 1990 | .00 | 27.00 |
| 1991 | .00 | 25.00 |
| 1992 | .00 | 28.00 |
| 1993 | .00 | 27.00 |
| 1994 | .00 | 27.00 |
| 1995 | .00 | 28.00 |
| 1996 | .00 | 30.00 |
| 1997 | .00 | 30.00 |
| 1998 | .00 | 29.00 |
| 1999 | .00 | 27.00 |
| 2000 | .00 | 38.00 |
| 2001 | .00 | 50.00 |
| 2002 | .00 | 35.00 |
| 2003 | .00 | 55.00 |
| 2004 | .00 | 80.00 |
| 2005 | .00 | 76.00 |
| 2006 | .00 | 95.00 |
| 2007 | .00 | 120.00 |
| 2008 | .00 | 112.00 |
| 2009 | .00 | 120.00 |
| 2010 | .00 | 168.00 |
| 2011 | .00 | 133.00 |
| 2012 | .00 | 125.00 |
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