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 were backflips made illegal in figure skating?" whose answer is 1976.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when backflips were made illegal in figure skating
Useful Output:

Doc 1: Backflips were, and still are, illegal in competitions according to the International Skating Union (ISU). Bonaly's daring wasn't just limited
Doc 2: The ban came into effect in 1977. "I think it's fun, I think it's great they do this," she told Olympics.com in Madrid at a recent ceremony
Doc 3: It's too dangerous with head/spine injuries  which is why the head banger, death spiral in pairs is also illegal. Because at the end of the
Doc 4: Why Are Backflips Banned In Ice Skating? Have you ever been captivated by the elegance of figure skating and the artistry involved?
Doc 5: Why Is Backflip Banned In Ice Skating? In this video, we take a closer look at the fascinating history behind the ban on backflips in