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Loading...
| year | production | consumption |
| 1980 | .30 | .30 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | 8.10 | 17.00 |
| 1985 | 7.80 | 17.00 |
| 1986 | 9.10 | 18.00 |
| 1987 | 8.10 | 19.00 |
| 1988 | 9.40 | 21.00 |
| 1989 | 11.00 | 22.00 |
| 1990 | 12.00 | 25.00 |
| 1991 | 10.00 | 26.00 |
| 1992 | 12.00 | 28.00 |
| 1993 | 11.00 | 30.00 |
| 1994 | 16.00 | 33.00 |
| 1995 | 13.00 | 34.00 |
| 1996 | 12.00 | 37.00 |
| 1997 | 12.00 | 37.00 |
| 1998 | 13.00 | 35.00 |
| 1999 | 11.00 | 35.00 |
| 2000 | 8.70 | 33.00 |
| 2001 | 12.00 | 33.00 |
| 2002 | 11.00 | 32.00 |
| 2003 | 12.00 | 30.00 |
| 2004 | 12.00 | 30.00 |
| 2005 | 12.00 | 28.00 |
| 2006 | 13.00 | 27.00 |
| 2007 | 11.00 | 28.00 |
| 2008 | 12.00 | 27.00 |
| 2009 | 9.90 | 23.00 |
| 2010 | 11.00 | 23.00 |
| 2011 | 8.80 | 22.00 |
| 2012 | 7.00 | 19.00 |
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