According to the 2010 Mount McKinely climbing report
Altogether, 670 of the 1,223 climbers who attempted Mount McKinley this year reached the summit — or 55 percent. That’s slightly above normal. Since 1970, the most successful year for climbers was 1977 with 79 percent. The least successful year was 1971, with 29 percent.
Here’s the report itself.
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