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Loading...
| year | production | consumption |
| 1980 | 316.00 | 60.00 |
| 1981 | 343.00 | 62.00 |
| 1982 | 324.00 | 70.00 |
| 1983 | 331.00 | 52.00 |
| 1984 | 303.00 | 44.00 |
| 1985 | 295.00 | 53.00 |
| 1986 | 293.00 | 33.00 |
| 1987 | 308.00 | 57.00 |
| 1988 | 304.00 | 48.00 |
| 1989 | 307.00 | 57.00 |
| 1990 | 318.00 | 50.00 |
| 1991 | 277.00 | 15.00 |
| 1992 | 286.00 | 35.00 |
| 1993 | 292.00 | 29.00 |
| 1994 | 297.00 | 25.00 |
| 1995 | 330.00 | 34.00 |
| 1996 | 325.00 | 28.00 |
| 1997 | 324.00 | 31.00 |
| 1998 | 315.00 | 27.00 |
| 1999 | 334.00 | 37.00 |
| 2000 | 349.00 | 39.00 |
| 2001 | 366.00 | 48.00 |
| 2002 | 383.00 | 59.00 |
| 2003 | 403.00 | 61.00 |
| 2004 | 406.00 | 71.00 |
| 2005 | 406.00 | 83.00 |
| 2006 | 487.00 | 141.00 |
| 2007 | 475.00 | 145.00 |
| 2008 | 473.00 | 148.00 |
| 2009 | 399.00 | 88.00 |
| 2010 | 417.00 | 105.00 |
| 2011 | 439.00 | 107.00 |
| 2012 | 418.00 | 104.00 |
| 2013 | 440.00 | 105.00 |
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