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Loading...
| year | production | consumption |
| 1986 | .00 | .00 |
| 1987 | .00 | .10 |
| 1988 | .00 | .20 |
| 1989 | .00 | .20 |
| 1990 | .00 | .20 |
| 1991 | .20 | .30 |
| 1992 | .40 | .20 |
| 1993 | .20 | .20 |
| 1994 | .10 | .10 |
| 1995 | 1.40 | .20 |
| 1996 | .50 | .40 |
| 1997 | .20 | .20 |
| 1998 | 1.60 | .30 |
| 1999 | 1.60 | .40 |
| 2000 | 1.50 | .30 |
| 2002 | .60 | .20 |
| 2003 | .00 | .30 |
| 2004 | .00 | .50 |
| 2005 | .00 | .10 |
| 2006 | .00 | 4.70 |
| 2009 | .00 | .70 |
| 2010 | .00 | .50 |
| 2011 | .00 | .60 |
| 2012 | .00 | 1.30 |
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