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| year | production | consumption |
| 1986 | 203.00 | 223.00 |
| 1987 | 185.00 | 244.00 |
| 1988 | 210.00 | 242.00 |
| 1989 | 228.00 | 275.00 |
| 1990 | 300.00 | 280.00 |
| 1991 | 261.00 | 276.00 |
| 1992 | 265.00 | 271.00 |
| 1993 | 283.00 | 289.00 |
| 1994 | 281.00 | 259.00 |
| 1995 | 271.00 | 271.00 |
| 1996 | 270.00 | 246.00 |
| 1997 | 355.00 | 260.00 |
| 1998 | 371.00 | 220.00 |
| 1999 | 404.00 | 231.00 |
| 2000 | 433.00 | 182.00 |
| 2001 | 423.00 | 212.00 |
| 2002 | 449.00 | 216.00 |
| 2003 | 477.00 | 240.00 |
| 2004 | 470.00 | 250.00 |
| 2005 | 480.00 | 259.00 |
| 2006 | 481.00 | 259.00 |
| 2007 | 459.00 | 283.00 |
| 2008 | 486.00 | 329.00 |
| 2009 | 479.00 | 361.00 |
| 2010 | 480.00 | 319.00 |
| 2011 | 484.00 | 319.00 |
| 2012 | 503.00 | 421.00 |
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