Thumbs
Thumbs is mainly used as an indication to see if something is perceived as positive or negative. But you could also use it for a question that only has 2 answers. You can choose which icon to use for your answers, and whether to show the labels or not.
Similar to Goal Completion Rate, you can add the thumbs element twice to your chart, to see how often something is perceived as positive/negative.
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Rating chart example
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