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| year | production | consumption |
| 1980 | 1,905.00 | 1,838.00 |
| 1981 | 1,883.00 | 2,082.00 |
| 1982 | 2,145.00 | 2,524.00 |
| 1983 | 1,955.00 | 2,347.00 |
| 1984 | 2,123.00 | 2,601.00 |
| 1985 | 2,390.00 | 3,256.00 |
| 1986 | 2,331.00 | 3,366.00 |
| 1987 | 2,377.00 | 3,504.00 |
| 1988 | 3,006.00 | 3,971.00 |
| 1989 | 2,887.00 | 3,878.00 |
| 1990 | 3,033.00 | 4,682.00 |
| 1991 | 3,183.00 | 4,437.00 |
| 1992 | 3,388.00 | 4,594.00 |
| 1993 | 3,389.00 | 5,101.00 |
| 1994 | 3,543.00 | 4,562.00 |
| 1995 | 3,354.00 | 5,204.00 |
| 1996 | 3,820.00 | 4,842.00 |
| 1997 | 3,854.00 | 4,540.00 |
| 1998 | 3,815.00 | 4,818.00 |
| 1999 | 3,491.00 | 4,545.00 |
| 2000 | 3,411.00 | 4,457.00 |
| 2001 | 3,668.00 | 4,861.00 |
| 2002 | 3,651.00 | 5,390.00 |
| 2003 | 3,610.00 | 6,683.00 |
| 2004 | 5,056.00 | 8,702.00 |
| 2005 | 5,369.00 | 8,503.00 |
| 2006 | 4,016.00 | 8,702.00 |
| 2007 | 4,546.00 | 11,145.00 |
| 2008 | 4,122.00 | 9,249.00 |
| 2009 | 3,837.00 | 8,973.00 |
| 2010 | 3,804.00 | 8,509.00 |
| 2011 | 3,983.00 | 8,455.00 |
| 2012 | 3,504.00 | 7,594.00 |
| 2013 | 3,368.00 | 7,929.00 |
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