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| year | production | consumption |
| 1980 | 1,915.00 | 1,935.00 |
| 1981 | 1,234.00 | 1,648.00 |
| 1982 | 1,132.00 | 1,189.00 |
| 1983 | 1,027.00 | 1,369.00 |
| 1984 | 937.00 | 1,111.00 |
| 1985 | 764.00 | 951.00 |
| 1986 | 693.00 | 866.00 |
| 1987 | 655.00 | 828.00 |
| 1988 | 665.00 | 850.00 |
| 1989 | 695.00 | 868.00 |
| 1990 | 749.00 | 898.00 |
| 1991 | 747.00 | 850.00 |
| 1992 | 791.00 | 860.00 |
| 1993 | 795.00 | 809.00 |
| 1994 | 864.00 | 875.00 |
| 1995 | 809.00 | 796.00 |
| 1996 | 742.00 | 749.00 |
| 1997 | 764.00 | 721.00 |
| 1998 | 739.00 | 709.00 |
| 1999 | 683.00 | 698.00 |
| 2000 | 649.00 | 653.00 |
| 2001 | 598.00 | 599.00 |
| 2002 | 569.00 | 569.00 |
| 2003 | 650.00 | 661.00 |
| 2004 | 576.00 | 590.00 |
| 2005 | 577.00 | 582.00 |
| 2006 | 553.00 | 546.00 |
| 2007 | 526.00 | 525.00 |
| 2008 | 513.00 | 543.00 |
| 2009 | 423.00 | 420.00 |
| 2010 | 388.00 | 394.00 |
| 2011 | 398.00 | 439.00 |
| 2012 | 461.00 | 550.00 |
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