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Loading...
| year | production | consumption |
| 1980 | 10.00 | 10.00 |
| 1981 | 11.00 | 11.00 |
| 1982 | 10.00 | 10.00 |
| 1983 | 11.00 | 11.00 |
| 1984 | 11.00 | 11.00 |
| 1985 | 10.00 | 10.00 |
| 1986 | 14.00 | 14.00 |
| 1987 | 16.00 | 16.00 |
| 1988 | 25.00 | 25.00 |
| 1989 | 25.00 | 25.00 |
| 1990 | 9.00 | 9.00 |
| 1991 | 5.00 | 5.00 |
| 1992 | 3.60 | 3.60 |
| 1993 | 1.10 | 1.10 |
| 1994 | 1.10 | 1.10 |
| 1995 | 1.10 | 1.10 |
| 1996 | 1.10 | 1.10 |
| 1997 | .70 | .70 |
| 1998 | 1.10 | 1.10 |
| 1999 | .70 | .70 |
| 2000 | 1.10 | 1.10 |
| 2001 | 1.10 | 1.10 |
| 2002 | 1.10 | 1.10 |
| 2003 | 1.10 | 1.10 |
| 2004 | 1.10 | 1.10 |
| 2005 | 1.10 | 1.10 |
| 2006 | 1.10 | 1.10 |
| 2007 | .40 | .40 |
| 2008 | 1.10 | 1.10 |
| 2009 | 1.10 | 1.10 |
| 2010 | .40 | .40 |
| 2011 | .40 | .40 |
| 2012 | .60 | .60 |
| 2013 | .70 | .70 |
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