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Loading...
| year | production | consumption |
| 1980 | 6.30 | 6.30 |
| 1981 | 6.00 | .00 |
| 1982 | 6.00 | .00 |
| 1983 | 5.00 | .00 |
| 1984 | 166.00 | 641.00 |
| 1985 | 140.00 | 614.00 |
| 1986 | 124.00 | 615.00 |
| 1987 | 125.00 | 628.00 |
| 1988 | 130.00 | 591.00 |
| 1989 | 138.00 | 644.00 |
| 1990 | 141.00 | 628.00 |
| 1991 | 145.00 | 611.00 |
| 1992 | 150.00 | 637.00 |
| 1993 | 146.00 | 660.00 |
| 1994 | 146.00 | 632.00 |
| 1995 | 156.00 | 657.00 |
| 1996 | 155.00 | 668.00 |
| 1997 | 162.00 | 664.00 |
| 1998 | 152.00 | 652.00 |
| 1999 | 155.00 | 673.00 |
| 2000 | 156.00 | 640.00 |
| 2001 | 164.00 | 634.00 |
| 2002 | 147.00 | 621.00 |
| 2003 | 145.00 | 605.00 |
| 2004 | 139.00 | 577.00 |
| 2005 | 154.00 | 561.00 |
| 2006 | 153.00 | 574.00 |
| 2007 | 151.00 | 553.00 |
| 2008 | 147.00 | 533.00 |
| 2009 | 146.00 | 508.00 |
| 2010 | 143.00 | 501.00 |
| 2011 | 134.00 | 500.00 |
| 2012 | 132.00 | 536.00 |
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