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Bill (itsagas) posted an update Monday, Dec 9, 2013, 10:46pm EST, 11 years, 10 months ago
jude51,
Because (s)he had 10.487 total feedbacks in the last 12 months. Neutrals don't count and 4 negatives out of that many feedbacks gives him/her a positive rating of 99.962% which rounds up to 100%.