"non academic" doesn't look right to me. The other two are both used. Search results suggest that the hyphenated form is more popular in BrE and the unhyphenated more popular in AmE.
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Little GirlSorry. I forgot to insert the link.Here it is:http://www.grammarmudge.cityslide.com/articles/article/426348/2805.htmThat is one American's opinion. It does not reflect common practice in the UK. It is also not difficult to find examp
Little GirlI see. On average, what percentage of Brits do you think may tend to use the unhyphenated form?I have no idea, but here are the search results I referred to earlier: