|
| year | production | consumption |
| 1980 | 442.53 | 972.01 |
| 1981 | 495.93 | 942.49 |
| 1982 | 515.21 | 944.36 |
| 1983 | 461.46 | 967.21 |
| 1984 | 488.62 | 1,134.85 |
| 1985 | 503.06 | 1,150.99 |
| 1986 | 563.73 | 1,216.67 |
| 1987 | 576.48 | 1,345.93 |
| 1988 | 587.43 | 1,460.28 |
| 1989 | 599.58 | 1,581.23 |
| 1990 | 611.00 | 1,674.00 |
| 1991 | 614.00 | 1,775.00 |
| 1992 | 640.97 | 1,760.31 |
| 1993 | 690.73 | 1,800.99 |
| 1994 | 728.80 | 1,748.13 |
| 1995 | 719.86 | 1,920.61 |
| 1996 | 707.50 | 1,984.14 |
| 1997 | 680.41 | 2,047.56 |
| 1998 | 671.30 | 2,204.54 |
| 1999 | 617.16 | 2,396.09 |
| 2000 | 587.39 | 2,498.36 |
| 2001 | 538.27 | 2,505.21 |
| 2002 | 516.41 | 2,488.22 |
| 2003 | 490.35 | 2,743.30 |
| 2004 | 457.72 | 2,846.71 |
| 2005 | 426.29 | 3,046.45 |
| 2006 | 387.72 | 2,983.52 |
| 2007 | 342.77 | 2,998.14 |
| 2008 | 326.84 | 2,997.64 |
| 2009 | 282.98 | 2,755.42 |
| 2010 | 296.86 | 2,934.57 |
| 2011 | 298.38 | 2,751.64 |
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