You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was the last time sunderland were relegated?" whose answer is the 1986–87 season.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Sunderland last relegated year
Useful Output:

Doc 1: Sunderland have been relegated to League One  Archived post. New comments cannot be posted and votes cannot be cast.
Doc 2:  Sunderland team that was relegated  Sunderland's Relegated 2016-17 Premier League XI: Where Are They Now? 181K views · 5 years ago
Doc 3: Sunderland relegated to League One · Tyne Tees · Saturday 21 April 2018 at 5:46pm.
Doc 4: SUNDERLAND were relegated to England's third tier for the first time in 30 years on Saturday as the Championship's bottom club lost 2-1 to
Doc 5: Sunderland relegated to England's third tier for first time in 30 years after defeat against Burton. Agence France-Presse • April 22, 2018, 11: