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Loading...
| year | production | consumption |
| 1980 | .00 | 12.00 |
| 1981 | .00 | 12.00 |
| 1982 | .00 | 12.00 |
| 1983 | .00 | 12.00 |
| 1984 | .00 | 14.00 |
| 1985 | .00 | 14.00 |
| 1986 | .00 | 14.00 |
| 1987 | .00 | 16.00 |
| 1988 | .00 | 15.00 |
| 1989 | .00 | 15.00 |
| 1990 | .00 | 16.00 |
| 1991 | .20 | 15.00 |
| 1992 | 53.00 | 15.00 |
| 1993 | 126.00 | 15.00 |
| 1994 | 110.00 | 15.00 |
| 1995 | 100.00 | 15.00 |
| 1996 | 103.00 | 15.00 |
| 1997 | 80.00 | 15.00 |
| 1998 | 79.00 | 15.00 |
| 1999 | 97.00 | 15.00 |
| 2000 | 70.00 | 15.00 |
| 2001 | 68.00 | 15.00 |
| 2002 | 55.00 | 22.00 |
| 2003 | 50.00 | 25.00 |
| 2004 | 46.00 | 25.00 |
| 2005 | 40.00 | 25.00 |
| 2006 | 44.00 | 27.00 |
| 2007 | 42.00 | 26.00 |
| 2008 | 38.00 | 20.00 |
| 2009 | 35.00 | 20.00 |
| 2010 | 30.00 | 20.00 |
| 2011 | 30.00 | 20.00 |
| 2012 | 27.00 | 20.00 |
| 2013 | 28.00 | 20.00 |
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