Here's a figure I haven't seen before. We know that Medicare Advantage membership rates are rising steadily, but how much does it vary by state? A lot, and Kaiser Family Foundation (KFF) gives us a color map, dated 1/2021. Find it here:
https://www.kff.org/medicare/issue-brief/a-dozen-facts-about-medicare-advantage-in-2020/
note that the low-enrollment color, orange, 11-20%, covers a very small part of the population. (Sorry, North Dakota...)