|
| year | production | consumption |
| 1984 | 367.23 | 423.08 |
| 1985 | 387.33 | 416.85 |
| 1986 | 374.09 | 427.92 |
| 1987 | 383.95 | 429.14 |
| 1988 | 415.69 | 434.71 |
| 1989 | 358.77 | 428.05 |
| 1990 | 314.76 | 422.06 |
| 1991 | 396.13 | 415.14 |
| 1992 | 406.87 | 407.31 |
| 1993 | 406.60 | 395.81 |
| 1994 | 398.52 | 382.36 |
| 1995 | 409.38 | 362.88 |
| 1996 | 387.30 | 346.66 |
| 1997 | 397.96 | 339.13 |
| 1998 | 418.19 | 337.10 |
| 1999 | 391.45 | 334.90 |
| 2000 | 360.49 | 318.40 |
| 2001 | 371.17 | 310.17 |
| 2002 | 350.96 | 299.41 |
| 2003 | 392.49 | 280.54 |
| 2004 | 391.29 | 266.13 |
| 2005 | 379.47 | 250.74 |
| 2006 | 401.94 | 236.14 |
| 2007 | 389.23 | 225.47 |
| 2008 | 386.84 | 206.10 |
| 2009 | 365.81 | 198.75 |
| 2010 | 316.68 | 186.43 |
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