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| year | production | consumption |
| 1980 | 66.00 | 1,229.00 |
| 1981 | 76.00 | 1,426.00 |
| 1982 | 68.00 | 1,442.00 |
| 1983 | 83.00 | 1,646.00 |
| 1984 | 77.00 | 1,644.00 |
| 1985 | 63.00 | 1,748.00 |
| 1986 | 60.00 | 2,571.00 |
| 1987 | 50.00 | 3,584.00 |
| 1988 | 50.00 | 3,578.00 |
| 1989 | 47.00 | 3,779.00 |
| 1990 | 28.00 | 3,391.00 |
| 1991 | 1.10 | 3,434.00 |
| 1992 | 1.10 | 3,102.00 |
| 1993 | 1.10 | 3,059.00 |
| 1994 | 1.10 | 2,946.00 |
| 1995 | 1.10 | 2,954.00 |
| 1996 | .00 | 3,279.00 |
| 1997 | .00 | 3,125.00 |
| 1998 | .00 | 3,276.00 |
| 1999 | .00 | 2,787.00 |
| 2000 | .00 | 3,320.00 |
| 2001 | .00 | 3,360.00 |
| 2002 | .00 | 3,009.00 |
| 2003 | .00 | 3,114.00 |
| 2004 | .00 | 3,198.00 |
| 2005 | .00 | 3,331.00 |
| 2006 | .00 | 2,933.00 |
| 2007 | .00 | 2,858.00 |
| 2008 | .00 | 2,543.00 |
| 2009 | .00 | 2,080.00 |
| 2010 | .00 | 2,269.00 |
| 2011 | .00 | 2,350.00 |
| 2012 | .00 | 2,709.00 |
| 2013 | .00 | 2,368.00 |
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