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| year | production | consumption |
| 1980 | 1,563.00 | 1,742.00 |
| 1981 | 1,698.00 | 1,863.00 |
| 1982 | 1,874.00 | 2,083.00 |
| 1983 | 2,039.00 | 2,260.00 |
| 1984 | 2,216.00 | 2,447.00 |
| 1985 | 2,370.00 | 2,612.00 |
| 1986 | 2,389.00 | 2,716.00 |
| 1987 | 2,352.00 | 2,533.00 |
| 1988 | 2,407.00 | 2,654.00 |
| 1989 | 2,417.00 | 2,682.00 |
| 1990 | 2,282.00 | 2,364.00 |
| 1991 | 1,198.00 | 1,330.00 |
| 1992 | 403.00 | 348.00 |
| 1993 | 236.00 | 227.00 |
| 1994 | 186.00 | 186.00 |
| 1995 | 88.00 | 88.00 |
| 1996 | 125.00 | 125.00 |
| 1997 | 43.00 | 43.00 |
| 1998 | 54.00 | 54.00 |
| 1999 | 54.00 | 130.00 |
| 2000 | 33.00 | 80.00 |
| 2001 | 23.00 | 98.00 |
| 2002 | 17.00 | 68.00 |
| 2003 | 64.00 | 71.00 |
| 2004 | 64.00 | 71.00 |
| 2005 | 50.00 | 60.00 |
| 2006 | 50.00 | 60.00 |
| 2007 | 50.00 | 60.00 |
| 2008 | 94.00 | 77.00 |
| 2009 | 15.00 | 177.00 |
| 2010 | 15.00 | 195.00 |
| 2011 | 5.50 | 239.00 |
| 2012 | 5.50 | 279.00 |
| 2013 | 2.20 | 116.00 |
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