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| year | production | consumption |
| 1980 | 368.40 | 1,508.40 |
| 1981 | 347.00 | 1,587.00 |
| 1982 | 303.00 | 1,607.00 |
| 1983 | 359.00 | 1,544.00 |
| 1984 | 1,157.40 | 3,417.00 |
| 1985 | 1,126.00 | 3,471.60 |
| 1986 | 2,091.50 | 4,331.20 |
| 1987 | 1,927.10 | 4,644.00 |
| 1988 | 2,021.70 | 4,761.40 |
| 1989 | 2,079.10 | 5,382.00 |
| 1990 | 2,077.40 | 5,556.50 |
| 1991 | 2,338.60 | 5,997.90 |
| 1992 | 2,616.70 | 5,882.50 |
| 1993 | 2,564.40 | 5,973.40 |
| 1994 | 2,754.80 | 6,224.30 |
| 1995 | 2,982.80 | 6,438.90 |
| 1996 | 2,988.50 | 6,746.50 |
| 1997 | 2,971.80 | 6,881.70 |
| 1998 | 3,069.10 | 6,717.40 |
| 1999 | 3,171.80 | 7,027.90 |
| 2000 | 3,206.40 | 7,499.70 |
| 2001 | 3,390.40 | 7,428.50 |
| 2002 | 3,739.40 | 7,720.00 |
| 2003 | 3,785.40 | 7,785.80 |
| 2004 | 3,898.20 | 8,069.80 |
| 2005 | 3,889.00 | 7,876.40 |
| 2006 | 3,878.00 | 7,924.50 |
| 2007 | 3,625.30 | 8,751.40 |
| 2008 | 3,607.50 | 8,345.30 |
| 2009 | 3,794.60 | 8,289.30 |
| 2010 | 3,692.50 | 9,141.80 |
| 2011 | 3,629.70 | 9,303.70 |
| 2012 | 3,669.60 | 9,102.50 |
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