How to prevent iPad from keeping pushing iOS 11 to me?

My iPad Air 2 keeps downloading iOS 11 in the background and then tries to push me into upgrading. I don't want that. I have declined it numerous times, and recovered the storage space it takes up from the download, but every time it keeps doing it over and over. Is there a way for my iPad (currently running iOS 10) to stop downloading or bothering me about iOS 11 at all?