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As you can see the numbers start at around 14.5%, then rocket up in early 2009, largely to the the economic collapse and dramatic job losses. There's a spike in the middle of 2013 which may indeed be tied to the churn and cancellation of policies which didn't meet ACA standards. But from then on it's virtually straight down.
This follows a new poll which found that even the overwhelming majority of Republicans (74%) say they like the plans they bought through Obamacare.