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| year | production | consumption |
| 1986 | 220.00 | 255.00 |
| 1987 | 160.00 | 290.00 |
| 1988 | 170.00 | 300.00 |
| 1989 | 207.00 | 315.00 |
| 1990 | 260.00 | 320.00 |
| 1991 | 248.00 | 354.00 |
| 1992 | 277.00 | 358.00 |
| 1993 | 290.00 | 416.00 |
| 1994 | 295.00 | 365.00 |
| 1995 | 297.00 | 388.00 |
| 1996 | 298.00 | 375.00 |
| 1997 | 317.00 | 410.00 |
| 1998 | 345.00 | 396.00 |
| 1999 | 368.00 | 391.00 |
| 2000 | 400.00 | 426.00 |
| 2001 | 461.00 | 427.00 |
| 2002 | 452.00 | 432.00 |
| 2003 | 447.00 | 443.00 |
| 2004 | 485.00 | 471.00 |
| 2005 | 500.00 | 483.00 |
| 2006 | 506.00 | 510.00 |
| 2007 | 513.00 | 555.00 |
| 2008 | 536.00 | 579.00 |
| 2009 | 536.00 | 552.00 |
| 2010 | 572.00 | 596.00 |
| 2011 | 595.00 | 583.00 |
| 2012 | 590.00 | 580.00 |
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