View win rate and buy rate percentages for each changed AP item across patches and tiers, and sort it alphabetically or by percentage. Mouseover the graph to get the detailed numbers.
Plus, we have a reference of all the changes at the bottom, too.
AP Item Statistics
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Note 1: Win rate percentages are counted per match. If multiple people purchase an AP item in a single match, we'll be considering that 1 count—in this match, this specific AP item was bought. (So if at least one person on each team buys it, it's always a 50% win rate.)
Note 2: Buy rate percentages represent which AP items were in a player's final build at the end of a match.