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| year | production | consumption |
| 1980 | 20,531.00 | 30,633.00 |
| 1981 | 21,897.00 | 33,984.00 |
| 1982 | 22,174.00 | 34,480.00 |
| 1983 | 21,893.00 | 36,739.00 |
| 1984 | 23,556.00 | 43,184.00 |
| 1985 | 24,849.00 | 46,854.00 |
| 1986 | 26,734.00 | 49,395.00 |
| 1987 | 26,757.00 | 49,661.00 |
| 1988 | 26,781.00 | 52,383.00 |
| 1989 | 22,912.00 | 50,155.00 |
| 1990 | 18,978.00 | 49,357.00 |
| 1991 | 16,599.00 | 48,013.00 |
| 1992 | 13,195.00 | 43,407.00 |
| 1993 | 10,409.00 | 47,942.00 |
| 1994 | 8,199.00 | 47,963.00 |
| 1995 | 6,305.00 | 49,451.00 |
| 1996 | 5,458.00 | 50,253.00 |
| 1997 | 4,976.00 | 57,696.00 |
| 1998 | 4,807.00 | 58,141.00 |
| 1999 | 4,626.00 | 63,701.00 |
| 2000 | 9,149.00 | 79,095.00 |
| 2001 | 8,415.00 | 85,778.00 |
| 2002 | 3,657.00 | 85,287.00 |
| 2003 | 3,635.00 | 83,901.00 |
| 2004 | 3,517.00 | 87,823.00 |
| 2005 | 3,122.00 | 90,291.00 |
| 2006 | 3,113.00 | 92,280.00 |
| 2007 | 3,181.00 | 100,873.00 |
| 2008 | 3,057.00 | 112,910.00 |
| 2009 | 2,777.00 | 117,198.00 |
| 2010 | 2,297.00 | 132,964.00 |
| 2011 | 2,297.00 | 146,150.00 |
| 2012 | 2,308.00 | 138,424.00 |
| 2013 | 2,001.00 | 142,464.00 |
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