|
| year | production | consumption |
| 1980 | 317.47 | 1,601.66 |
| 1981 | 451.95 | 1,490.33 |
| 1982 | 485.02 | 1,498.04 |
| 1983 | 555.56 | 1,499.14 |
| 1984 | 497.14 | 1,822.12 |
| 1985 | 558.87 | 1,857.40 |
| 1986 | 481.71 | 1,651.26 |
| 1987 | 439.82 | 1,570.79 |
| 1988 | 291.01 | 1,611.58 |
| 1989 | 396.83 | 1,586.23 |
| 1990 | 334.00 | 1,408.75 |
| 1991 | 363.76 | 1,280.89 |
| 1992 | 395.73 | 1,254.43 |
| 1993 | 295.42 | 1,388.91 |
| 1994 | 331.80 | 1,612.68 |
| 1995 | 321.87 | 1,673.31 |
| 1996 | 253.53 | 1,641.34 |
| 1997 | 425.49 | 1,682.13 |
| 1998 | 361.56 | 1,750.47 |
| 1999 | 445.33 | 1,736.14 |
| 2000 | 696.66 | 1,757.08 |
| 2001 | 1,970.93 | 1,543.24 |
| 2002 | 2,350.13 | 1,329.39 |
| 2003 | 3,245.21 | 1,289.70 |
| 2004 | 3,201.11 | 1,515.68 |
| 2005 | 1,621.50 | 1,268.76 |
| 2006 | 2,640.04 | 1,165.14 |
| 2007 | 4,489.71 | 1,315.06 |
| 2008 | 3,780.93 | 1,404.35 |
| 2009 | 2,911.20 | 917.12 |
| 2010 | 2,132.97 | 1,370.17 |
| 2011 | 1,527.80 | 1,363.56 |
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