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| year | production | consumption |
| 1980 | 491.00 | 499.00 |
| 1981 | 496.00 | 483.00 |
| 1982 | 491.00 | 468.00 |
| 1983 | 491.00 | 477.00 |
| 1984 | 478.00 | 463.00 |
| 1985 | 460.00 | 415.00 |
| 1986 | 434.00 | 448.00 |
| 1987 | 428.00 | 479.00 |
| 1988 | 449.00 | 475.00 |
| 1989 | 460.00 | 434.00 |
| 1990 | 483.00 | 413.00 |
| 1991 | 485.00 | 424.00 |
| 1992 | 553.00 | 455.00 |
| 1993 | 594.00 | 468.00 |
| 1994 | 650.00 | 471.00 |
| 1995 | 715.00 | 475.00 |
| 1996 | 756.00 | 489.00 |
| 1997 | 834.00 | 498.00 |
| 1998 | 847.00 | 542.00 |
| 1999 | 802.00 | 534.00 |
| 2000 | 761.00 | 531.00 |
| 2001 | 802.00 | 517.00 |
| 2002 | 799.00 | 477.00 |
| 2003 | 783.00 | 494.00 |
| 2004 | 733.00 | 545.00 |
| 2005 | 704.00 | 565.00 |
| 2006 | 696.00 | 622.00 |
| 2007 | 679.00 | 618.00 |
| 2008 | 661.00 | 677.00 |
| 2009 | 651.00 | 655.00 |
| 2010 | 626.00 | 709.00 |
| 2011 | 581.00 | 729.00 |
| 2012 | 551.00 | 742.00 |
| 2013 | 540.00 | 770.00 |
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