|
| year | production | consumption |
| 1980 | 595.00 | 260.00 |
| 1981 | 598.00 | 300.00 |
| 1982 | 670.00 | 320.00 |
| 1983 | 727.00 | 376.00 |
| 1984 | 822.00 | 406.00 |
| 1985 | 887.00 | 430.00 |
| 1986 | 813.00 | 427.57 |
| 1987 | 896.00 | 441.86 |
| 1988 | 848.00 | 436.90 |
| 1989 | 865.00 | 442.51 |
| 1990 | 873.00 | 465.04 |
| 1991 | 874.00 | 456.49 |
| 1992 | 881.22 | 443.82 |
| 1993 | 890.00 | 450.02 |
| 1994 | 895.70 | 447.98 |
| 1995 | 920.00 | 458.49 |
| 1996 | 921.67 | 501.10 |
| 1997 | 856.40 | 531.43 |
| 1998 | 833.60 | 554.88 |
| 1999 | 851.59 | 563.87 |
| 2000 | 768.33 | 552.80 |
| 2001 | 719.66 | 544.67 |
| 2002 | 715.42 | 564.70 |
| 2003 | 712.67 | 561.11 |
| 2004 | 673.38 | 603.92 |
| 2005 | 623.32 | 625.24 |
| 2006 | 535.06 | 658.44 |
| 2007 | 530.35 | 693.53 |
| 2008 | 565.74 | 700.72 |
| 2009 | 586.52 | 720.71 |
| 2010 | 575.15 | 737.62 |
| 2011 | 566.47 | 697.00 |
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