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Loading...
| year | production | consumption |
| 1980 | .00 | 72.00 |
| 1981 | .00 | 53.00 |
| 1982 | .00 | 67.00 |
| 1983 | .00 | 49.00 |
| 1984 | .00 | 45.00 |
| 1985 | .00 | 36.00 |
| 1986 | .00 | 31.00 |
| 1987 | .00 | 31.00 |
| 1988 | .00 | 18.00 |
| 1989 | .00 | 12.00 |
| 1990 | .00 | 20.00 |
| 1991 | .00 | 12.00 |
| 1992 | .00 | 13.00 |
| 1993 | .00 | 17.00 |
| 1994 | .00 | 19.00 |
| 1995 | .00 | 19.00 |
| 1996 | .00 | 19.00 |
| 1997 | .00 | 19.00 |
| 1998 | .00 | 14.00 |
| 1999 | 70.00 | 61.00 |
| 2000 | 87.00 | 69.00 |
| 2001 | 53.00 | 52.00 |
| 2002 | 66.00 | 75.00 |
| 2003 | 73.00 | 71.00 |
| 2004 | 55.00 | 67.00 |
| 2005 | 50.00 | 65.00 |
| 2006 | 61.00 | 65.00 |
| 2007 | 66.00 | 67.00 |
| 2008 | 58.00 | 57.00 |
| 2009 | 60.00 | 53.00 |
| 2010 | 60.00 | 60.00 |
| 2011 | 60.00 | 60.00 |
| 2012 | 60.00 | 60.00 |
| 2013 | 60.00 | 60.00 |
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