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| year | production | consumption |
| 1980 | 1,200.00 | 1,251.00 |
| 1981 | 1,240.00 | 1,267.00 |
| 1982 | 1,350.00 | 1,411.00 |
| 1983 | 1,400.00 | 1,446.00 |
| 1984 | 1,338.00 | 1,395.00 |
| 1985 | 1,271.00 | 1,336.00 |
| 1986 | 1,340.00 | 1,410.00 |
| 1987 | 1,317.00 | 1,405.00 |
| 1988 | 1,280.00 | 1,306.00 |
| 1989 | 1,130.00 | 1,384.00 |
| 1990 | 1,001.00 | 1,261.00 |
| 1991 | 876.00 | 1,040.00 |
| 1992 | 777.00 | 936.00 |
| 1993 | 746.00 | 908.00 |
| 1994 | 692.00 | 851.00 |
| 1995 | 683.00 | 901.00 |
| 1996 | 634.00 | 894.00 |
| 1997 | 614.00 | 830.00 |
| 1998 | 516.00 | 650.00 |
| 1999 | 501.00 | 622.00 |
| 2000 | 480.00 | 600.00 |
| 2001 | 505.00 | 696.00 |
| 2002 | 470.00 | 646.00 |
| 2003 | 434.00 | 636.00 |
| 2004 | 417.00 | 636.00 |
| 2005 | 413.00 | 643.00 |
| 2006 | 449.00 | 658.00 |
| 2007 | 432.00 | 605.00 |
| 2008 | 403.00 | 561.00 |
| 2009 | 384.00 | 455.00 |
| 2010 | 374.00 | 455.00 |
| 2011 | 375.00 | 486.00 |
| 2012 | 375.00 | 476.00 |
| 2013 | 385.00 | 453.00 |
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