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| year | production | consumption |
| 1980 | 42.00 | 273.00 |
| 1981 | 62.00 | 299.00 |
| 1982 | 74.00 | 294.00 |
| 1983 | 78.00 | 277.00 |
| 1984 | 96.00 | 289.00 |
| 1985 | 95.00 | 293.00 |
| 1986 | 108.00 | 306.00 |
| 1987 | 82.00 | 126.00 |
| 1988 | 72.00 | 116.00 |
| 1989 | 72.00 | 115.00 |
| 1990 | 76.00 | 130.00 |
| 1991 | 83.00 | 133.00 |
| 1992 | 80.00 | 72.00 |
| 1993 | 64.00 | 37.00 |
| 1994 | 58.00 | 31.00 |
| 1995 | 64.00 | 42.00 |
| 1996 | 58.00 | 34.00 |
| 1997 | 54.00 | 35.00 |
| 1998 | 57.00 | 36.00 |
| 1999 | 207.00 | 211.00 |
| 2000 | 639.00 | 639.00 |
| 2001 | 708.00 | 708.00 |
| 2002 | 537.00 | 537.00 |
| 2003 | 944.00 | 944.00 |
| 2004 | 515.00 | 480.00 |
| 2005 | 633.00 | 592.00 |
| 2006 | 808.00 | 762.00 |
| 2007 | 854.00 | 802.00 |
| 2008 | 737.00 | 704.00 |
| 2009 | 683.00 | 666.00 |
| 2010 | 756.00 | 750.00 |
| 2011 | 764.00 | 765.00 |
| 2012 | 1,299.00 | 901.00 |
| 2013 | 636.00 | 706.00 |
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