|
| year | production | consumption |
| 1984 | 61.25 | 294.11 |
| 1985 | 37.74 | 328.72 |
| 1986 | 43.10 | 360.86 |
| 1987 | 41.95 | 355.97 |
| 1988 | 47.93 | 381.12 |
| 1989 | 48.07 | 402.68 |
| 1990 | 53.39 | 349.67 |
| 1991 | 51.09 | 375.12 |
| 1992 | 43.74 | 407.25 |
| 1993 | 43.86 | 410.26 |
| 1994 | 70.93 | 402.70 |
| 1995 | 65.98 | 401.81 |
| 1996 | 63.51 | 393.74 |
| 1997 | 37.74 | 397.38 |
| 1998 | 28.21 | 400.33 |
| 1999 | 30.51 | 445.82 |
| 2000 | 23.21 | 485.31 |
| 2001 | 27.85 | 472.93 |
| 2002 | 27.85 | 457.30 |
| 2003 | 33.57 | 442.31 |
| 2004 | 33.48 | 450.99 |
| 2005 | 33.57 | 432.36 |
| 2006 | 28.19 | 425.87 |
| 2007 | 26.53 | 412.12 |
| 2008 | 25.77 | 424.89 |
| 2009 | 27.01 | 417.82 |
| 2010 | 25.42 | 424.24 |
|
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