About: http://webisa.webdatacommons.org/309054021

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The last one occurred in the 1970s, when prices leaped due to factors including surging demand from the then Soviet Union.Back in 2008 and 2009, Irwin and Good stated that a new plateau began in January 2007.
http://www.w3.org/ns/prov#wasQuotedFrom	agriculture.com