US Imports of Whale Oil and Sperm Oil.

When was the peak of the whale oil business? What happened to whale oil imports after the discovery of petroleum in 1859?

Citation: 
"US Imports of Whale Oil and Sperm Oil," in Walter S. Tower, "A History of the American Whale Fishery," Philadelphia: Pub. for the University, 1907, 126.
Library Item date: 
1907