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Loading...
| year | production | consumption |
| 1980 | 16.00 | 47.00 |
| 1981 | 6.00 | 37.00 |
| 1982 | 4.00 | 28.00 |
| 1983 | 8.00 | 23.00 |
| 1984 | 8.10 | 23.00 |
| 1985 | 8.40 | 21.00 |
| 1986 | 10.00 | 31.00 |
| 1987 | 9.70 | 23.00 |
| 1988 | 8.50 | 13.00 |
| 1989 | 8.90 | 12.00 |
| 1990 | 11.00 | 17.00 |
| 1991 | 11.00 | 21.00 |
| 1992 | 12.00 | 22.00 |
| 1993 | 12.00 | 22.00 |
| 1994 | 15.00 | 25.00 |
| 1995 | 14.00 | 24.00 |
| 1996 | 14.00 | 23.00 |
| 1997 | 18.00 | 27.00 |
| 1998 | 19.00 | 32.00 |
| 1999 | 17.00 | 38.00 |
| 2000 | 20.00 | 32.00 |
| 2001 | 20.00 | 33.00 |
| 2002 | 19.00 | 27.00 |
| 2003 | 18.00 | 21.00 |
| 2004 | 17.00 | 24.00 |
| 2005 | 19.00 | 23.00 |
| 2006 | 19.00 | 23.00 |
| 2007 | 22.00 | 15.00 |
| 2008 | 20.00 | 13.00 |
| 2009 | 16.00 | 9.30 |
| 2010 | 17.00 | 7.10 |
| 2011 | 19.00 | 5.50 |
| 2012 | 17.00 | 4.00 |
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