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Loading...
| year | production | consumption |
| 1980 | .00 | 12.00 |
| 1981 | .00 | 12.00 |
| 1982 | .00 | 13.00 |
| 1983 | .00 | 15.00 |
| 1984 | .00 | 15.00 |
| 1985 | .00 | 18.00 |
| 1986 | .00 | 17.00 |
| 1987 | .00 | 19.00 |
| 1988 | .00 | 19.00 |
| 1989 | .00 | 20.00 |
| 1990 | .00 | 20.00 |
| 1991 | .00 | 16.00 |
| 1992 | .00 | 23.00 |
| 1993 | .00 | 22.00 |
| 1994 | .00 | 14.00 |
| 1995 | .00 | 15.00 |
| 1996 | .00 | 12.00 |
| 1997 | .00 | 12.00 |
| 1998 | .00 | 17.00 |
| 1999 | .00 | 21.00 |
| 2000 | .00 | 23.00 |
| 2001 | .00 | 23.00 |
| 2002 | .00 | 26.00 |
| 2003 | .00 | 28.00 |
| 2004 | .00 | 29.00 |
| 2005 | .00 | 30.00 |
| 2006 | .00 | 34.00 |
| 2007 | .00 | 37.00 |
| 2008 | .00 | 47.00 |
| 2009 | .00 | 46.00 |
| 2010 | .00 | 42.00 |
| 2011 | .00 | 49.00 |
| 2012 | .00 | 52.00 |
| 2013 | .00 | 51.00 |
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