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| year | production | consumption |
| 1980 | 3,158.00 | 6,770.00 |
| 1981 | 3,374.00 | 7,113.00 |
| 1982 | 3,634.00 | 6,736.00 |
| 1983 | 3,352.00 | 6,995.00 |
| 1984 | 3,228.00 | 7,985.00 |
| 1985 | 3,396.00 | 7,767.00 |
| 1986 | 3,273.00 | 6,547.00 |
| 1987 | 3,071.00 | 6,715.00 |
| 1988 | 2,347.00 | 6,092.00 |
| 1989 | 2,277.00 | 6,199.00 |
| 1990 | 2,698.00 | 7,345.00 |
| 1991 | 2,294.00 | 7,554.00 |
| 1992 | 1,953.00 | 5,448.00 |
| 1993 | 1,865.00 | 4,836.00 |
| 1994 | 1,510.00 | 4,798.00 |
| 1995 | 1,431.00 | 5,660.00 |
| 1996 | 1,221.00 | 5,969.00 |
| 1997 | 1,246.00 | 5,938.00 |
| 1998 | 1,257.00 | 5,064.00 |
| 1999 | 1,253.00 | 5,583.00 |
| 2000 | 1,377.00 | 5,627.00 |
| 2001 | 1,329.00 | 6,129.00 |
| 2002 | 1,556.00 | 5,955.00 |
| 2003 | 1,270.00 | 6,575.00 |
| 2004 | 259.00 | 6,110.00 |
| 2005 | .00 | 5,870.00 |
| 2006 | .00 | 5,504.00 |
| 2007 | .00 | 4,813.00 |
| 2008 | .00 | 4,527.00 |
| 2009 | .00 | 3,605.00 |
| 2010 | .00 | 4,238.00 |
| 2011 | .00 | 4,333.00 |
| 2012 | .00 | 3,943.00 |
| 2013 | .00 | 3,948.00 |
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