|
| year | production | consumption |
| 1980 | 491.00 | 499.00 |
| 1981 | 496.00 | 483.00 |
| 1982 | 491.00 | 468.00 |
| 1983 | 491.00 | 477.00 |
| 1984 | 478.00 | 463.00 |
| 1985 | 460.00 | 415.10 |
| 1986 | 434.00 | 448.37 |
| 1987 | 428.00 | 479.42 |
| 1988 | 449.00 | 475.00 |
| 1989 | 460.00 | 433.78 |
| 1990 | 483.00 | 413.00 |
| 1991 | 485.00 | 423.68 |
| 1992 | 552.96 | 445.19 |
| 1993 | 594.00 | 467.69 |
| 1994 | 650.11 | 458.23 |
| 1995 | 715.00 | 453.40 |
| 1996 | 755.98 | 478.55 |
| 1997 | 834.10 | 476.26 |
| 1998 | 846.68 | 491.57 |
| 1999 | 802.20 | 523.20 |
| 2000 | 761.14 | 510.93 |
| 2001 | 802.40 | 474.39 |
| 2002 | 799.15 | 438.30 |
| 2003 | 783.11 | 449.99 |
| 2004 | 732.66 | 471.79 |
| 2005 | 703.65 | 483.01 |
| 2006 | 696.45 | 535.42 |
| 2007 | 678.78 | 586.97 |
| 2008 | 661.22 | 581.88 |
| 2009 | 651.18 | 588.62 |
| 2010 | 626.06 | 620.26 |
| 2011 | 581.43 | 685.00 |
|
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