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| year | production | consumption |
| 1986 | 242.00 | 163.00 |
| 1987 | 254.00 | 168.00 |
| 1988 | 264.00 | 173.00 |
| 1989 | 256.00 | 162.00 |
| 1990 | 244.00 | 165.00 |
| 1991 | 227.00 | 173.00 |
| 1992 | 335.00 | 178.00 |
| 1993 | 365.00 | 180.00 |
| 1994 | 375.00 | 178.00 |
| 1995 | 376.00 | 188.00 |
| 1996 | 395.00 | 186.00 |
| 1997 | 409.00 | 182.00 |
| 1998 | 434.00 | 158.00 |
| 1999 | 402.00 | 181.00 |
| 2000 | 384.00 | 210.00 |
| 2001 | 356.00 | 229.00 |
| 2002 | 347.00 | 206.00 |
| 2003 | 274.00 | 208.00 |
| 2004 | 361.00 | 183.00 |
| 2005 | 394.00 | 223.00 |
| 2006 | 368.00 | 250.00 |
| 2007 | 346.00 | 269.00 |
| 2008 | 351.00 | 274.00 |
| 2009 | 385.00 | 261.00 |
| 2010 | 299.00 | 245.00 |
| 2011 | 267.00 | 239.00 |
| 2012 | 249.00 | 271.00 |
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