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Congress ordered the CDC to gather those stats in the late nineties, if I have my dates right. The CDC ignored them, claiming that by definition any study that required non-immunized kids, even volunteers, was unethical.
Jenny McCarthy's nonprofit did the study, 100,000 random surveys by phone, found the rate was much lower in non-immunized and much higher in partially-immunized (presumably because in cases where there's an obvious regression parents stop,) but no one listens to her anymore.
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