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| year | production | consumption |
| 1980 | 75.00 | 186.00 |
| 1981 | 51.00 | 159.00 |
| 1982 | 47.00 | 154.00 |
| 1983 | 43.00 | 157.00 |
| 1984 | 45.00 | 175.00 |
| 1985 | 41.00 | 188.00 |
| 1986 | 39.00 | 182.00 |
| 1987 | 41.00 | 190.00 |
| 1988 | 44.00 | 181.00 |
| 1989 | 47.00 | 195.00 |
| 1990 | 45.00 | 215.00 |
| 1991 | 47.00 | 228.00 |
| 1992 | 51.00 | 224.00 |
| 1993 | 53.00 | 235.00 |
| 1994 | 48.00 | 242.00 |
| 1995 | 52.00 | 262.00 |
| 1996 | 53.00 | 281.00 |
| 1997 | 50.00 | 271.00 |
| 1998 | 55.00 | 279.00 |
| 1999 | 61.00 | 285.00 |
| 2000 | 64.00 | 272.00 |
| 2001 | 61.00 | 288.00 |
| 2002 | 66.00 | 291.00 |
| 2003 | 74.00 | 315.00 |
| 2004 | 69.00 | 311.00 |
| 2005 | 61.00 | 354.00 |
| 2006 | 68.00 | 332.00 |
| 2007 | 69.00 | 313.00 |
| 2008 | 57.00 | 331.00 |
| 2009 | 62.00 | 323.00 |
| 2010 | 64.00 | 353.00 |
| 2011 | 63.00 | 335.00 |
| 2012 | 67.00 | 319.00 |
| 2013 | 48.00 | 301.00 |
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