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Loading...
| year | production | consumption |
| 1980 | .00 | 522.00 |
| 1981 | .00 | 481.00 |
| 1982 | .00 | 445.00 |
| 1983 | .00 | 407.00 |
| 1984 | .00 | 385.00 |
| 1985 | .00 | 405.00 |
| 1986 | .00 | 454.00 |
| 1987 | .00 | 457.00 |
| 1988 | .00 | 470.00 |
| 1989 | .00 | 462.00 |
| 1990 | .00 | 463.00 |
| 1991 | .00 | 497.00 |
| 1992 | .00 | 509.00 |
| 1993 | .00 | 500.00 |
| 1994 | .00 | 553.00 |
| 1995 | .00 | 550.00 |
| 1996 | .00 | 593.00 |
| 1997 | .00 | 611.00 |
| 1998 | .00 | 622.00 |
| 1999 | .00 | 593.00 |
| 2000 | .00 | 606.00 |
| 2001 | .00 | 609.00 |
| 2002 | .00 | 617.00 |
| 2003 | .00 | 655.00 |
| 2004 | .00 | 657.00 |
| 2005 | .00 | 664.00 |
| 2006 | .00 | 642.00 |
| 2007 | .00 | 649.00 |
| 2008 | .00 | 702.00 |
| 2009 | .00 | 638.00 |
| 2010 | .00 | 669.00 |
| 2011 | .00 | 629.00 |
| 2012 | .00 | 607.00 |
| 2013 | .00 | 629.00 |
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