|
| year | production | consumption |
| 1980 | 53.52 | 253.04 |
| 1981 | 115.94 | 263.65 |
| 1982 | 90.75 | 286.96 |
| 1983 | 115.85 | 249.23 |
| 1984 | 132.30 | 232.62 |
| 1985 | 163.94 | 310.55 |
| 1986 | 191.25 | 290.46 |
| 1987 | 139.94 | 324.02 |
| 1988 | 155.21 | 382.28 |
| 1989 | 132.58 | 333.20 |
| 1990 | 107.15 | 256.81 |
| 1991 | 62.60 | 438.47 |
| 1992 | 94.78 | 425.88 |
| 1993 | 91.60 | 605.12 |
| 1994 | 69.47 | 551.49 |
| 1995 | 56.68 | 580.84 |
| 1996 | 22.82 | 606.98 |
| 1997 | 24.30 | 633.96 |
| 1998 | 23.18 | 691.53 |
| 1999 | 23.80 | 631.54 |
| 2000 | 18.33 | 980.91 |
| 2001 | 20.79 | 893.34 |
| 2002 | 24.35 | 1,208.62 |
| 2003 | 17.27 | 1,193.70 |
| 2004 | 17.97 | 1,219.41 |
| 2005 | 46.96 | 1,594.60 |
| 2006 | 113.17 | 1,224.84 |
| 2007 | 118.01 | 1,608.72 |
| 2008 | 146.77 | 1,440.12 |
| 2009 | 160.30 | 1,073.75 |
| 2010 | 101.37 | 1,175.27 |
| 2011 | 108.52 | 1,141.94 |
|
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