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Loading...
| year | production | consumption |
| 1986 | .00 | 9.60 |
| 1987 | .00 | 9.60 |
| 1990 | .30 | 13.00 |
| 1991 | .30 | 23.00 |
| 1992 | .30 | 26.00 |
| 1993 | .30 | 33.00 |
| 1994 | .30 | 36.00 |
| 1995 | .30 | 41.00 |
| 1996 | .30 | 57.00 |
| 1997 | .40 | 55.00 |
| 1998 | .30 | 63.00 |
| 1999 | .00 | 77.00 |
| 2000 | .00 | 82.00 |
| 2002 | .00 | 83.00 |
| 2003 | .00 | 90.00 |
| 2004 | .00 | 112.00 |
| 2005 | .00 | 115.00 |
| 2006 | .00 | 107.00 |
| 2007 | .00 | 125.00 |
| 2008 | .00 | 125.00 |
| 2009 | 11.00 | 129.00 |
| 2010 | 55.00 | 149.00 |
| 2011 | 55.00 | 155.00 |
| 2012 | 61.00 | 164.00 |
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