Scroll to bottom for list of their sources.
You can copy the data from their spreadsheet directly and paste it into one of your own to work with, which is what I did.
I stumbled onto comparing new deaths to total deaths and deriving a ratio for a metric which seems to give a fair indication of how well countries are doing in fighting the Corona virus. Of all the data columns possible to use, and I've experimented with several (e.g., total cases, new cases, total deaths, recovered, etc.), these seem to give the least unexplained variation between countries, and seems to reflect what we're seeing on the ground in each country.
I've included China, but I personally don't put a lot of trust in the validity of their numbers. South Korea, by far, seems to have had the most success. And compared with the EU, the US isn't doing too bad either - though we have a long way to go to get to where South Korea is (no new deaths). One big supersize is Iraq, but I'm not sure how valid their reporting is.
I did not include countries with less than 10 fatalities, and the data is a couple of days old now.
Im continually impressed that Germany has such a low death rate from this given the numbers and increases. The nordic countries are also similar... I’ve never been surprised by the italian or spanish numbers... even their university hospitals are horrid.
How can anyone use “cases” as a valid data point? So many not tested.
ICU cases and deaths are probably the only valid data. When these start declining, we’ll know we can soon live normal lives again.