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Unless you have the details of the instrument, you can't determine the "bs-ness" of the poll itself. The questions are biased, but all poll questions are. You cannot avoid bias...you can limit it, but not avoid it.
The plot is at best sloppy, at worst manipulative. Could be they only had data points for those years and they didn't understand the right way to scale the x axis. Or they wanted to emphasize the climb from 2001 to 2006 and give an incorrect slope. While people love to make their point, don't underestimate the cluelessness of people plotting data...
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