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Loading...
| year | production | consumption |
| 1980 | 15.00 | 225.00 |
| 1981 | 2.00 | 212.00 |
| 1982 | 8.00 | 209.00 |
| 1983 | 13.00 | 195.00 |
| 1984 | 12.00 | 167.00 |
| 1985 | 9.00 | 152.00 |
| 1986 | 8.00 | 159.00 |
| 1987 | 6.00 | 188.00 |
| 1988 | 6.00 | 196.00 |
| 1989 | 5.00 | 229.00 |
| 1990 | 4.70 | 236.00 |
| 1991 | 3.00 | 235.00 |
| 1992 | 8.00 | 260.00 |
| 1993 | 9.10 | 285.00 |
| 1994 | 6.10 | 303.00 |
| 1995 | 3.40 | 328.00 |
| 1996 | 2.00 | 346.00 |
| 1997 | 1.00 | 365.00 |
| 1998 | .80 | 381.00 |
| 1999 | .90 | 370.00 |
| 2000 | 1.10 | 353.00 |
| 2001 | 8.50 | 347.00 |
| 2002 | 9.90 | 338.00 |
| 2003 | 14.00 | 333.00 |
| 2004 | 25.00 | 337.00 |
| 2005 | 25.00 | 312.00 |
| 2006 | 25.00 | 285.00 |
| 2007 | 25.00 | 300.00 |
| 2008 | 25.00 | 287.00 |
| 2009 | 24.00 | 300.00 |
| 2010 | 33.00 | 309.00 |
| 2011 | 27.00 | 301.00 |
| 2012 | 20.00 | 310.00 |
| 2013 | 21.00 | 314.00 |
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