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Loading...
| year | production | consumption |
| 1980 | 252.00 | 285.00 |
| 1981 | 241.00 | 270.00 |
| 1982 | 223.00 | 261.00 |
| 1983 | 248.00 | 265.00 |
| 1984 | 226.00 | 234.00 |
| 1985 | 196.00 | 212.00 |
| 1986 | 197.00 | 208.00 |
| 1987 | 193.00 | 200.00 |
| 1988 | 237.00 | 251.00 |
| 1989 | 281.00 | 290.00 |
| 1990 | 275.00 | 333.00 |
| 1991 | 431.00 | 403.00 |
| 1992 | 511.00 | 465.00 |
| 1993 | 540.00 | 495.00 |
| 1994 | 563.00 | 541.00 |
| 1995 | 598.00 | 559.00 |
| 1996 | 608.00 | 545.00 |
| 1997 | 641.00 | 575.00 |
| 1998 | 566.00 | 432.00 |
| 1999 | 648.00 | 469.00 |
| 2000 | 620.00 | 487.00 |
| 2001 | 606.00 | 485.00 |
| 2002 | 508.00 | 462.00 |
| 2003 | 549.00 | 457.00 |
| 2004 | 544.00 | 439.00 |
| 2005 | 571.00 | 434.00 |
| 2006 | 561.00 | 417.00 |
| 2007 | 497.00 | 397.00 |
| 2008 | 405.00 | 332.00 |
| 2009 | 337.00 | 320.00 |
| 2010 | 341.00 | 321.00 |
| 2011 | 337.00 | 278.00 |
| 2012 | 281.00 | 269.00 |
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