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| year | production | consumption |
| 1980 | 20.00 | 2,357.00 |
| 1981 | 18.00 | 2,282.00 |
| 1982 | 14.00 | 2,751.00 |
| 1983 | 14.00 | 3,321.00 |
| 1984 | 14.00 | 4,006.00 |
| 1985 | 13.00 | 4,583.00 |
| 1986 | 13.00 | 4,694.00 |
| 1987 | 28.00 | 4,604.00 |
| 1988 | 18.00 | 4,355.00 |
| 1989 | 22.00 | 3,945.00 |
| 1990 | 12.00 | 4,088.00 |
| 1991 | 31.00 | 3,801.00 |
| 1992 | 41.00 | 3,617.00 |
| 1993 | 4.40 | 3,630.00 |
| 1994 | .50 | 4,199.00 |
| 1995 | .00 | 3,952.00 |
| 1996 | .00 | 3,898.00 |
| 1997 | .00 | 3,406.00 |
| 1998 | .00 | 3,095.00 |
| 1999 | .00 | 2,966.00 |
| 2000 | .00 | 2,955.00 |
| 2001 | .00 | 3,563.00 |
| 2002 | .00 | 3,084.00 |
| 2003 | .00 | 2,797.00 |
| 2004 | .00 | 3,577.00 |
| 2005 | .00 | 3,179.00 |
| 2006 | .00 | 2,983.00 |
| 2007 | .00 | 3,289.00 |
| 2008 | .00 | 2,492.00 |
| 2009 | .00 | 2,626.00 |
| 2010 | .00 | 2,854.00 |
| 2011 | .00 | 3,487.00 |
| 2012 | .00 | 3,232.00 |
| 2013 | .00 | 3,219.00 |
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