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| year | production | consumption |
| 1980 | 1,580.00 | 2,508.00 |
| 1981 | 1,321.00 | 2,088.00 |
| 1982 | 1,070.00 | 1,716.00 |
| 1983 | 852.00 | 1,421.00 |
| 1984 | 891.00 | 1,369.00 |
| 1985 | 882.00 | 1,202.00 |
| 1986 | 889.00 | 1,418.00 |
| 1987 | 885.00 | 1,264.00 |
| 1988 | 926.00 | 1,378.00 |
| 1989 | 954.00 | 1,370.00 |
| 1990 | 950.00 | 1,229.00 |
| 1991 | 934.00 | 1,158.00 |
| 1992 | 892.00 | 1,094.00 |
| 1993 | 835.00 | 1,080.00 |
| 1994 | 826.00 | 1,021.00 |
| 1995 | 788.00 | 852.00 |
| 1996 | 726.00 | 848.00 |
| 1997 | 708.00 | 797.00 |
| 1998 | 762.00 | 887.00 |
| 1999 | 698.00 | 830.00 |
| 2000 | 696.00 | 909.00 |
| 2001 | 721.00 | 811.00 |
| 2002 | 601.00 | 700.00 |
| 2003 | 660.00 | 772.00 |
| 2004 | 655.00 | 865.00 |
| 2005 | 628.00 | 920.00 |
| 2006 | 635.00 | 689.00 |
| 2007 | 673.00 | 723.00 |
| 2008 | 620.00 | 622.00 |
| 2009 | 598.00 | 511.00 |
| 2010 | 585.00 | 535.00 |
| 2011 | 537.00 | 461.00 |
| 2012 | 501.00 | 369.00 |
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