楼主可以去找一本叫The National Data Book of USA ,这里只找到2008 Edition:
http://wenku.baidu.com/view/dbcfc83183c4bb4cf7ecd166.html
Agriculture这一章里有一张表叫:Principal Crops—Production, Supply, and Disappearance:, 里面有你要的数据
例如:
Item Unit 1990 2000 2002 2003 2004 2005 2006
CORN FOR GRAIN
Acreage harvested . . . . . Million . . . . . . . 67.0 72.4 69.3 70.9 73.6 75.1 70.6
Yield per acre . . . . . . . . Bushel. . . . . . . 119 137 129 142 160 148 149
Production . . . . . . . . . . Mil. bu. . . . . . . 7,934 9,915 8,967 10,089 11,807 11,114 10,535
Farm price 1 . . . . . . . . . Dol./bu. . . . . . . 2.28 1.85 2.32 2.42 2.06 2.00 3.20
Farm value . . . . . . . . . . Mil. dol. . . . . . . 18,192 18,499 20,882 24,477 24,381 22,198 33,837
Total supply 2 . . . . . . . . Mil. bu. . . . . . . 9,282 11,639 10,578 11,190 12,776 13,237 12,512
Total disappearance 3 . . . Mil. bu. . . . . . . 7,761 9,740 9,491 10,232 10,662 11,270 11,760
Ethanol . . . . . . . . . . . Mil. bu. . . . . . . (NA) (NA) 996 1,168 1,323 1,603 2,150
Exports . . . . . . . . . . . Mil. bu. . . . . . . 1,725 1,941 1,588 1,900 1,818 2,147 2,250
Ending stocks . . . . . . . . Mil. bu. . . . . . . 1,521 1,899 1,087 958 2,114 1,967 752
另有美国农业统计署网址:
http://www.agcensus.usda.gov/