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| year | production | consumption |
| 1980 | 2,246.00 | 3,126.00 |
| 1981 | 1,997.00 | 2,654.00 |
| 1982 | 1,683.00 | 2,228.00 |
| 1983 | 1,430.00 | 1,925.00 |
| 1984 | 1,442.00 | 1,896.00 |
| 1985 | 1,402.00 | 1,725.00 |
| 1986 | 1,408.00 | 1,967.50 |
| 1987 | 1,432.00 | 1,857.90 |
| 1988 | 1,486.00 | 2,000.90 |
| 1989 | 1,526.00 | 2,059.90 |
| 1990 | 1,525.00 | 1,802.50 |
| 1991 | 1,485.00 | 1,748.50 |
| 1992 | 1,427.00 | 1,670.20 |
| 1993 | 1,397.00 | 1,646.20 |
| 1994 | 1,364.00 | 1,631.20 |
| 1995 | 1,313.00 | 1,394.30 |
| 1996 | 1,265.00 | 1,409.30 |
| 1997 | 1,259.00 | 1,416.30 |
| 1998 | 1,341.00 | 1,566.30 |
| 1999 | 1,240.00 | 1,472.30 |
| 2000 | 1,239.00 | 1,569.30 |
| 2001 | 1,289.00 | 1,480.30 |
| 2002 | 1,186.00 | 1,286.30 |
| 2003 | 1,197.00 | 1,325.30 |
| 2004 | 1,182.00 | 1,403.40 |
| 2005 | 1,129.00 | 1,446.30 |
| 2006 | 1,101.00 | 1,102.40 |
| 2007 | 1,128.00 | 1,139.60 |
| 2008 | 1,051.00 | 988.50 |
| 2009 | 1,030.00 | 852.70 |
| 2010 | 1,029.00 | 834.70 |
| 2011 | 965.00 | 758.70 |
| 2012 | 906.00 | 670.70 |
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