|
| year | production | consumption |
| 1984 | 462.03 | 446.79 |
| 1985 | 418.51 | 425.79 |
| 1986 | 415.76 | 446.67 |
| 1987 | 345.99 | 442.90 |
| 1988 | 362.17 | 486.16 |
| 1989 | 352.80 | 462.03 |
| 1990 | 399.07 | 456.85 |
| 1991 | 422.37 | 469.07 |
| 1992 | 447.63 | 477.49 |
| 1993 | 465.38 | 484.88 |
| 1994 | 469.43 | 483.87 |
| 1995 | 471.95 | 508.46 |
| 1996 | 486.27 | 530.21 |
| 1997 | 476.77 | 497.80 |
| 1998 | 477.93 | 491.21 |
| 1999 | 460.35 | 508.41 |
| 2000 | 480.05 | 511.91 |
| 2001 | 484.61 | 528.02 |
| 2002 | 464.97 | 510.44 |
| 2003 | 488.42 | 516.13 |
| 2004 | 458.00 | 473.33 |
| 2005 | 485.88 | 511.34 |
| 2006 | 460.42 | 456.72 |
| 2007 | 397.43 | 400.10 |
| 2008 | 354.39 | 362.39 |
| 2009 | 350.15 | 348.74 |
| 2010 | 340.05 | 350.12 |
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