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| year | production | consumption |
| 1980 | 1,622.00 | 1,725.00 |
| 1981 | 1,811.00 | 1,590.00 |
| 1982 | 2,065.00 | 1,590.00 |
| 1983 | 2,291.00 | 1,531.00 |
| 1984 | 2,480.00 | 1,825.00 |
| 1985 | 2,530.00 | 1,617.00 |
| 1986 | 2,539.00 | 1,637.00 |
| 1987 | 2,406.00 | 1,611.00 |
| 1988 | 2,232.00 | 1,692.00 |
| 1989 | 1,802.00 | 1,731.00 |
| 1990 | 1,820.00 | 1,776.00 |
| 1991 | 1,797.00 | 1,803.00 |
| 1992 | 1,825.00 | 1,815.00 |
| 1993 | 1,915.00 | 1,829.00 |
| 1994 | 2,375.00 | 1,833.00 |
| 1995 | 2,489.00 | 1,816.00 |
| 1996 | 2,568.00 | 1,852.00 |
| 1997 | 2,518.00 | 1,810.00 |
| 1998 | 2,616.00 | 1,792.00 |
| 1999 | 2,684.00 | 1,811.00 |
| 2000 | 2,275.00 | 1,765.00 |
| 2001 | 2,282.00 | 1,747.00 |
| 2002 | 2,292.00 | 1,739.00 |
| 2003 | 2,093.00 | 1,759.00 |
| 2004 | 1,845.00 | 1,789.00 |
| 2005 | 1,649.00 | 1,819.00 |
| 2006 | 1,490.00 | 1,806.00 |
| 2007 | 1,498.00 | 1,751.00 |
| 2008 | 1,391.00 | 1,731.00 |
| 2009 | 1,328.00 | 1,635.00 |
| 2010 | 1,233.00 | 1,618.00 |
| 2011 | 1,026.00 | 1,577.00 |
| 2012 | 888.00 | 1,527.00 |
| 2013 | 801.00 | 1,502.00 |
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