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I have extensively looked for this too to try and correct for inaccurate estimations of mine and competitions traffic in SEM Rush.  If you're ranking like 25 for a 100,000 volume keyword SEM Rush attaches a value to that where in fact I expect there is no value much past page two. I'd say they only go as low as 0.1% CTR because to go any lower is worthless from an ROI and financial perspective.  I wouldn't imagine it changes much either.  Just keeps on going at around 0.1 until page ten or whatever.  The only real interesting insight I saw was that halfway down page two can be a better position than the top of page two.  So those keyword's just teetering on page one are a real focus for my SEO efforts. Have you tried getting in touch with Advanced Webranking.  They certainly will have more data but wanted the graph to be readable so just went to position 20.