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Loading...
| year | production | consumption |
| 1986 | .00 | .00 |
| 1987 | .00 | .00 |
| 1988 | .00 | .00 |
| 1989 | .00 | .00 |
| 1990 | .00 | .00 |
| 1991 | .00 | .00 |
| 1992 | .00 | .00 |
| 1993 | .00 | .00 |
| 1994 | .00 | .00 |
| 1995 | .00 | 1.40 |
| 1996 | .00 | 1.70 |
| 1997 | .00 | 1.70 |
| 1998 | .00 | 3.10 |
| 1999 | .00 | 3.80 |
| 2000 | .00 | 5.10 |
| 2001 | .00 | 5.80 |
| 2002 | .00 | 6.00 |
| 2003 | .00 | 6.30 |
| 2004 | .00 | 7.20 |
| 2005 | .00 | 7.40 |
| 2006 | .00 | 9.40 |
| 2007 | .00 | 9.50 |
| 2008 | .00 | 9.70 |
| 2009 | .00 | 9.90 |
| 2010 | .00 | 1.40 |
| 2011 | .00 | 3.30 |
| 2012 | .00 | 3.50 |
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