Don't you see how that's a non-sequitur? Here, maybe you'll spot your error if you just think it through a little more.
Says the person who can't grasp that skyrocketing costs only slightly less explosively skyrocketed once parts of Obamacare were dismantled.
The key question isn't how fast insurance premiums rise, but how fast healthcare costs rise, obviously. If all we wanted to do is lower the average insurance premium, we could automatically enroll everyone in an insurance policy that costs $10 per year and has as its only benefit the distribution of one free aspirin. That would be a terrible idea and would drive up healthcare costs, but it would drive down the average insurance premium. Obviously.
But...costs and insurance rates have continued exploding. And your entire counterpoint is that they exploded slightly less terribly once parts of Obamacare were dismantled...therefore, obviously, Obamacare lowered costs. You should cut back on the use of the word "obviously." You don't seem to know what it means.

Where do you get that figure?
From non-partisan Kaiser. There was such an "uninsured crisis" that almost everyone liked the existing system as it was.
http://www.dc-aapor.org/documents/DEANE_DC_AAPOR_8_18.pdf