|
| year | production | consumption |
| 1984 | 159.13 | 166.43 |
| 1985 | 148.94 | 168.96 |
| 1986 | 358.89 | 350.03 |
| 1987 | 336.82 | 367.32 |
| 1988 | 359.82 | 394.36 |
| 1989 | 379.69 | 421.76 |
| 1990 | 404.86 | 455.90 |
| 1991 | 372.13 | 467.03 |
| 1992 | 428.04 | 502.12 |
| 1993 | 417.62 | 536.42 |
| 1994 | 438.63 | 562.76 |
| 1995 | 456.85 | 604.88 |
| 1996 | 471.95 | 621.69 |
| 1997 | 492.16 | 648.82 |
| 1998 | 469.99 | 636.16 |
| 1999 | 540.13 | 654.12 |
| 2000 | 553.46 | 703.86 |
| 2001 | 558.75 | 733.02 |
| 2002 | 552.76 | 770.40 |
| 2003 | 544.36 | 770.74 |
| 2004 | 558.51 | 829.01 |
| 2005 | 550.65 | 855.34 |
| 2006 | 480.74 | 850.28 |
| 2007 | 497.72 | 860.54 |
| 2008 | 510.23 | 880.39 |
| 2009 | 301.63 | 858.23 |
| 2010 | 557.14 | 892.14 |
|
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