|
| year | production | consumption |
| 1984 | 399.93 | 383.99 |
| 1985 | 398.03 | 406.80 |
| 1986 | 405.30 | 426.49 |
| 1987 | 424.59 | 464.04 |
| 1988 | 420.80 | 470.98 |
| 1989 | 426.90 | 501.90 |
| 1990 | 425.08 | 400.21 |
| 1991 | 412.84 | 424.33 |
| 1992 | 407.57 | 412.53 |
| 1993 | 438.79 | 420.34 |
| 1994 | 422.86 | 474.44 |
| 1995 | 417.43 | 418.75 |
| 1996 | 422.66 | 443.14 |
| 1997 | 427.06 | 483.38 |
| 1998 | 446.52 | 513.67 |
| 1999 | 424.61 | 494.15 |
| 2000 | 424.43 | 510.92 |
| 2001 | 435.90 | 492.87 |
| 2002 | 460.78 | 436.74 |
| 2003 | 392.00 | 370.21 |
| 2004 | 369.65 | 357.88 |
| 2005 | 352.19 | 393.02 |
| 2006 | 325.89 | 311.09 |
| 2007 | 302.07 | 322.56 |
| 2008 | 289.26 | 254.86 |
| 2009 | 316.78 | 236.79 |
| 2010 | 322.87 | 208.98 |
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