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| year | production | consumption |
| 1980 | 46.00 | 46.00 |
| 1981 | 54.00 | 54.00 |
| 1982 | 56.00 | 56.00 |
| 1983 | 41.00 | 41.00 |
| 1984 | 56.00 | 56.00 |
| 1985 | 46.00 | 46.00 |
| 1986 | 63.00 | 63.00 |
| 1987 | 68.00 | 68.00 |
| 1988 | 1,202.00 | 93.00 |
| 1989 | 2,342.00 | 481.00 |
| 1990 | 2,936.00 | 850.00 |
| 1991 | 2,917.00 | .00 |
| 1992 | 3,286.00 | 6.70 |
| 1993 | 5,117.00 | 52.00 |
| 1994 | 5,737.00 | 102.00 |
| 1995 | 5,450.00 | 9.40 |
| 1996 | 4,880.00 | 30.00 |
| 1997 | 6,902.00 | 63.00 |
| 1998 | 10,000.00 | 1,780.00 |
| 1999 | 9,360.00 | 67.00 |
| 2000 | 10,575.00 | 243.00 |
| 2001 | 10,173.00 | 90.00 |
| 2002 | 9,883.00 | 34.00 |
| 2003 | 9,129.00 | 79.00 |
| 2004 | 9,050.00 | .00 |
| 2005 | 9,650.00 | 68.00 |
| 2006 | 10,556.00 | 80.00 |
| 2007 | 8,177.00 | 204.00 |
| 2008 | 6,601.00 | 259.00 |
| 2009 | 4,402.00 | 436.00 |
| 2010 | 3,661.00 | 366.00 |
| 2011 | 2,816.00 | 377.00 |
| 2012 | 4,185.00 | 404.00 |
| 2013 | 2,833.00 | 317.00 |
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