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| year | production | consumption |
| 1986 | 589.40 | 441.50 |
| 1987 | 609.20 | 417.50 |
| 1988 | 615.90 | 446.10 |
| 1989 | 632.50 | 452.70 |
| 1990 | 667.80 | 501.10 |
| 1991 | 672.90 | 496.10 |
| 1992 | 646.30 | 484.70 |
| 1993 | 670.20 | 479.80 |
| 1994 | 665.70 | 500.30 |
| 1995 | 691.70 | 472.20 |
| 1996 | 703.10 | 447.70 |
| 1997 | 674.40 | 478.70 |
| 1998 | 643.60 | 491.40 |
| 1999 | 704.80 | 508.70 |
| 2000 | 640.80 | 449.80 |
| 2001 | 673.10 | 442.20 |
| 2002 | 648.10 | 429.60 |
| 2003 | 677.40 | 433.50 |
| 2004 | 642.10 | 432.40 |
| 2005 | 699.10 | 452.00 |
| 2006 | 651.80 | 460.40 |
| 2007 | 593.80 | 432.50 |
| 2008 | 583.00 | 413.80 |
| 2009 | 554.70 | 409.90 |
| 2010 | 567.20 | 395.90 |
| 2011 | 501.70 | 375.00 |
| 2012 | 512.50 | 469.90 |
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