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| year | production | consumption |
| 1980 | 8,838.00 | 18,848.00 |
| 1981 | 9,093.00 | 18,643.00 |
| 1982 | 9,186.00 | 18,054.00 |
| 1983 | 8,274.00 | 16,596.00 |
| 1984 | 8,648.00 | 18,530.00 |
| 1985 | 8,450.00 | 17,583.00 |
| 1986 | 7,392.00 | 15,224.00 |
| 1987 | 5,926.00 | 15,900.00 |
| 1988 | 3,791.00 | 15,809.00 |
| 1989 | 4,004.00 | 17,759.00 |
| 1990 | 2,598.00 | 17,899.00 |
| 1991 | 2,323.00 | 16,758.00 |
| 1992 | 1,319.00 | 15,750.00 |
| 1993 | 1,070.00 | 13,849.00 |
| 1994 | 830.00 | 13,748.00 |
| 1995 | 702.00 | 13,194.00 |
| 1996 | 617.00 | 13,078.00 |
| 1997 | 471.00 | 13,137.00 |
| 1998 | 344.00 | 13,016.00 |
| 1999 | 401.00 | 11,484.00 |
| 2000 | 413.00 | 12,789.00 |
| 2001 | 240.00 | 11,424.00 |
| 2002 | 191.00 | 10,042.00 |
| 2003 | 142.00 | 9,851.00 |
| 2004 | 200.00 | 9,849.00 |
| 2005 | 120.00 | 8,428.00 |
| 2006 | 32.00 | 7,882.00 |
| 2007 | .00 | 7,132.00 |
| 2008 | .00 | 6,559.00 |
| 2009 | .00 | 5,340.00 |
| 2010 | .00 | 6,335.00 |
| 2011 | .00 | 5,588.00 |
| 2012 | .00 | 5,151.00 |
| 2013 | .00 | 5,439.00 |
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