OK cool. That gets us an awfully long way.
What I think is interesting about your graph is how it has no sudden shifts, it's all just up and up, slowly over time. It's quite even.
There are no bumps in your graph, therefore the introduction of one single vaccine, or change in one particular vaccine, is probably not the cause. If it was, there would be a spike 2 years after the change, followed by a plateau once the percentage of affected children had been diagnosed. Would you agree?
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