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Loading...
| year | production | consumption |
| 1980 | .00 | .00 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | .00 | .00 |
| 1985 | .00 | .00 |
| 1986 | .00 | .00 |
| 1987 | .00 | .00 |
| 1988 | .00 | .00 |
| 1989 | .00 | .00 |
| 1990 | .00 | .00 |
| 1991 | .00 | .00 |
| 1992 | 11.00 | 9.30 |
| 1993 | 9.70 | 6.10 |
| 1994 | 7.70 | 6.80 |
| 1995 | 5.70 | 6.10 |
| 1996 | 5.80 | 5.80 |
| 1997 | 5.00 | 5.50 |
| 1998 | 4.60 | 5.40 |
| 1999 | 4.20 | 4.10 |
| 2000 | 5.30 | 5.60 |
| 2001 | 5.60 | 5.40 |
| 2002 | 5.40 | 6.10 |
| 2003 | 5.60 | 7.10 |
| 2004 | 5.50 | 7.00 |
| 2005 | 5.60 | 7.00 |
| 2006 | 5.70 | 7.40 |
| 2007 | 5.60 | 6.80 |
| 2008 | 5.70 | 6.90 |
| 2009 | 5.80 | 5.90 |
| 2010 | 5.80 | 5.80 |
| 2011 | 5.50 | 4.90 |
| 2012 | 5.50 | 5.10 |
| 2013 | 5.50 | 5.80 |
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