cargo vs jetsam

cargo

noun
  • Freight carried by a ship, aircraft, or motor vehicle. 

  • Western material goods. 

jetsam

noun
  • Articles thrown overboard from a ship or boat in order to lighten the load of a ship in distress. 

  • Discarded odds and ends. 

How often have the words cargo and jetsam occurred in a corpus of books? (source: Google Ngram Viewer )