Removing all Mainland China data, I get 16.98%; 55 deaths / (55 plus 269 recoveries).
Now, in part, this high Case Fatality Rate probably reflects the absence of the work-in-progress of 2,857 non-Mainland China unresolved but alive people. They may not all die at a 17% rate - there will likely be improvements in treatment, heroic measures, learning and sharing of medical approaches globally that lowers the final CFR. In addition, the early deaths may have been the sickest people with which to begin. There is a LOT to factor in, but I'd rather do the math and sort it out later. Thanks.
That data set is a little thin:
Back on 1/31/20, there were 259 deaths, 284 recoveries, and that gives 47.7% fatalities.
When more cases came on board, the rate steadily improved.
Don't know why, but that's what the data says.
Cause for concern, but not yet panic. We'll see where it levels off presently.
Then we can re-evaluate whether to panic or not...