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| year | production | consumption |
| 1980 | 2,224.00 | 2,305.00 |
| 1981 | 1,536.00 | 2,005.00 |
| 1982 | 1,425.00 | 1,526.00 |
| 1983 | 1,340.00 | 1,699.00 |
| 1984 | 1,225.00 | 1,402.00 |
| 1985 | 1,021.00 | 1,228.00 |
| 1986 | 3,383.30 | 3,452.00 |
| 1987 | 3,414.20 | 3,495.40 |
| 1988 | 3,678.10 | 3,704.30 |
| 1989 | 3,910.50 | 3,886.20 |
| 1990 | 4,109.30 | 3,988.50 |
| 1991 | 3,917.10 | 4,065.60 |
| 1992 | 4,581.50 | 4,360.70 |
| 1993 | 4,687.90 | 4,526.50 |
| 1994 | 4,703.40 | 4,656.20 |
| 1995 | 4,649.20 | 4,651.20 |
| 1996 | 4,590.40 | 4,453.60 |
| 1997 | 4,755.00 | 4,781.80 |
| 1998 | 4,654.30 | 4,732.10 |
| 1999 | 4,554.20 | 4,752.20 |
| 2000 | 4,531.20 | 4,508.70 |
| 2001 | 4,267.50 | 4,405.20 |
| 2002 | 4,272.80 | 4,560.00 |
| 2003 | 4,498.10 | 4,701.80 |
| 2004 | 4,456.00 | 4,681.50 |
| 2005 | 4,555.20 | 4,792.60 |
| 2006 | 4,470.70 | 4,896.90 |
| 2007 | 4,179.70 | 4,893.10 |
| 2008 | 3,856.30 | 4,742.00 |
| 2009 | 3,766.40 | 4,736.20 |
| 2010 | 3,741.60 | 4,468.60 |
| 2011 | 3,674.00 | 4,414.40 |
| 2012 | 3,654.40 | 4,594.00 |
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