$20 Series 2012
The smaller denominations saw greater use from the folds apparent in the bills. The $20 less use was apparent but as with all Canadian and British polymer notes we've experienced, it is difficult to lay them out so they're flat on a surface. Once folded or bent they tend to maintain that shape.
Unfortunately, the USA and Eurozone are still committed to more easily forged paper notes with no inference that they will eventually convert to this harder to forge technology.