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Loading...
| year | production | consumption |
| 1980 | .00 | 262.00 |
| 1981 | 8.00 | 254.00 |
| 1982 | 21.00 | 239.00 |
| 1983 | 24.00 | 231.00 |
| 1984 | 26.00 | 232.00 |
| 1985 | 25.00 | 242.00 |
| 1986 | 25.00 | 246.00 |
| 1987 | 24.00 | 267.00 |
| 1988 | 21.00 | 279.00 |
| 1989 | 17.00 | 298.00 |
| 1990 | 15.00 | 314.00 |
| 1991 | 16.00 | 316.00 |
| 1992 | 13.00 | 323.00 |
| 1993 | 11.00 | 333.00 |
| 1994 | 10.00 | 340.00 |
| 1995 | 9.00 | 355.00 |
| 1996 | 8.00 | 368.00 |
| 1997 | 9.10 | 374.00 |
| 1998 | 6.50 | 392.00 |
| 1999 | .30 | 383.00 |
| 2000 | 4.70 | 399.00 |
| 2001 | 5.00 | 406.00 |
| 2002 | 3.20 | 408.00 |
| 2003 | 2.80 | 429.00 |
| 2004 | 2.80 | 420.00 |
| 2005 | 2.70 | 424.00 |
| 2006 | 1.80 | 444.00 |
| 2007 | 1.20 | 450.00 |
| 2008 | 1.00 | 429.00 |
| 2009 | 1.20 | 403.00 |
| 2010 | 2.30 | 372.00 |
| 2011 | 1.80 | 351.00 |
| 2012 | 1.70 | 306.00 |
| 2013 | 1.20 | 283.00 |
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