There is a form for Travel History. If this form does not show up in your document checklist then you can prepare a document (Word/Excel) in a tabular format: Details of each visa + entry/exit dates for each visit + purpose of the visit (for the last 10 years).
You would also scan any valid visas and include it in the explanation + any old visas for visa-required countries (US, UK, Schengen, Australia, NZ, Japan, etc)