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| year | production | consumption |
| 1980 | 6,492.00 | 6,579.00 |
| 1981 | 6,405.00 | 6,588.00 |
| 1982 | 6,338.00 | 6,539.00 |
| 1983 | 6,338.00 | 6,622.00 |
| 1984 | 6,453.00 | 6,693.00 |
| 1985 | 6,419.00 | 6,831.00 |
| 1986 | 6,752.00 | 7,034.00 |
| 1987 | 6,841.00 | 7,206.00 |
| 1988 | 6,956.00 | 7,336.00 |
| 1989 | 6,963.00 | 7,328.00 |
| 1990 | 6,959.00 | 7,235.00 |
| 1991 | 6,975.00 | 7,188.00 |
| 1992 | 7,058.00 | 7,268.00 |
| 1993 | 7,304.00 | 7,476.00 |
| 1994 | 7,181.00 | 7,601.00 |
| 1995 | 7,459.00 | 7,789.00 |
| 1996 | 7,565.00 | 7,891.00 |
| 1997 | 7,743.00 | 8,017.00 |
| 1998 | 7,892.00 | 8,253.00 |
| 1999 | 7,934.00 | 8,431.00 |
| 2000 | 7,951.00 | 8,472.00 |
| 2001 | 8,022.00 | 8,610.00 |
| 2002 | 8,183.00 | 8,848.00 |
| 2003 | 8,194.00 | 8,935.00 |
| 2004 | 8,265.00 | 9,105.00 |
| 2005 | 8,318.00 | 9,159.00 |
| 2006 | 8,364.00 | 9,253.00 |
| 2007 | 8,358.00 | 9,286.00 |
| 2008 | 8,548.00 | 8,989.00 |
| 2009 | 8,786.00 | 8,997.00 |
| 2010 | 9,059.00 | 8,993.00 |
| 2011 | 9,058.00 | 8,753.00 |
| 2012 | 8,926.00 | 8,682.00 |
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