Centre county Pennsylvania, USA | The folks at Mundi have monthly numbers for that era. Here is link to that data source:
http://www.indexmundi.com/commodities/?commodity=corn&months=240&co...
Attached txt file shows some Mundi monthly numbers for 1996 to 2016. Don't know how good those numbers are, but they check out pretty close for recent year. The Mundi ReturnOnCost (ROC) data is interesting. It shows that corn ROC was positive for some months in every year since 1996.
Attachments
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 crude_vs_corn_price_Mundi_data.txt (10KB - 53 downloads)
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Corn price thread from 2006
