Year 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005  
  Productiom Mt       86,570       88,505       95,472       104,990       101,257       107,875       106,422       132,888       151,131       143,065  
  Extent Ha. 8,197 8,240 8,319 8,796 8,605 9,241 8,675 11,421 13,404 12,026