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| year | production | consumption |
| 1986 | 378.00 | 294.00 |
| 1987 | 410.00 | 285.00 |
| 1988 | 454.00 | 293.00 |
| 1989 | 501.00 | 292.00 |
| 1990 | 512.00 | 267.00 |
| 1991 | 482.00 | 238.00 |
| 1992 | 492.00 | 230.00 |
| 1993 | 495.00 | 189.00 |
| 1994 | 452.00 | 175.00 |
| 1995 | 408.00 | 98.00 |
| 1996 | 388.00 | 97.00 |
| 1997 | 405.00 | 126.00 |
| 1998 | 408.00 | 163.00 |
| 1999 | 470.00 | 215.00 |
| 2000 | 470.00 | 183.00 |
| 2001 | 420.00 | 225.00 |
| 2002 | 432.00 | 214.00 |
| 2003 | 464.00 | 205.00 |
| 2004 | 472.00 | 313.00 |
| 2005 | 488.00 | 300.00 |
| 2006 | 496.00 | 327.00 |
| 2007 | 478.00 | 351.00 |
| 2008 | 478.00 | 365.00 |
| 2009 | 498.00 | 276.00 |
| 2010 | 445.00 | 285.00 |
| 2011 | 417.00 | 322.00 |
| 2012 | 461.00 | 322.00 |
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