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| year | production | consumption |
| 1980 | 324.00 | 295.00 |
| 1981 | 375.00 | 301.00 |
| 1982 | 370.00 | 293.00 |
| 1983 | 371.00 | 341.00 |
| 1984 | 400.00 | 384.00 |
| 1985 | 398.00 | 407.00 |
| 1986 | 405.00 | 426.00 |
| 1987 | 425.00 | 464.00 |
| 1988 | 421.00 | 471.00 |
| 1989 | 427.00 | 502.00 |
| 1990 | 425.00 | 400.00 |
| 1991 | 413.00 | 433.00 |
| 1992 | 408.00 | 421.00 |
| 1993 | 439.00 | 429.00 |
| 1994 | 423.00 | 484.00 |
| 1995 | 417.00 | 428.00 |
| 1996 | 423.00 | 454.00 |
| 1997 | 427.00 | 497.00 |
| 1998 | 447.00 | 528.00 |
| 1999 | 425.00 | 510.00 |
| 2000 | 424.00 | 529.00 |
| 2001 | 436.00 | 507.00 |
| 2002 | 461.00 | 448.00 |
| 2003 | 392.00 | 380.00 |
| 2004 | 370.00 | 370.00 |
| 2005 | 352.00 | 381.00 |
| 2006 | 326.00 | 300.00 |
| 2007 | 302.00 | 292.00 |
| 2008 | 289.00 | 255.00 |
| 2009 | 317.00 | 237.00 |
| 2010 | 323.00 | 215.00 |
| 2011 | 308.00 | 232.00 |
| 2012 | 274.00 | 236.00 |
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