Year-over-year

Wikipedia does not have an article on "year-over-year", but its sister project Wiktionary does:

Read the Wiktionary entry "year-over-year"

You can also:

Search for Year-over-year in Wikipedia to check for alternative titles or spellings.

Start the Year-over-year article, using the Article Wizard if you wish, or create a request for it; but please remember that Wikipedia is not a dictionary.