Not sure what you mean by 'combined' - you can't add up tests/M and get a meaningful number (though it is good for ranking). I think most people would agree that the US has been doing a lot of testing - even months ago there was a lot of testing in the US - you do have quite a good infrastructure for that.
Yes, I wasn't trying to average all the countries - overall that would have made them look worse.
My point was, just looking at the table it amazing that the USA number is so much bigger than the other top countries - the point being it's not just bigger, it's bigger than the sum of all the other top 8 countries combined! (again, that's just an observation, not a statistic)
I don't think that high test rate is getting you into a great club - both UK and Russia have had larger numbers of infected people than a lot of other countries - hence they have large numbers of tests. Both were also countries where the leadership denied there was an issue for probably too long. Developed countries like US / UK / Russia etc that didn't control the virus ended up doing more tests, but also had a higher positive rate as the tests were basically confirming people with symptoms actually had the virus.
The countries with good test regimes caught the infections early - and with the reduction in infections comes a reduction in tests. So places like S.Korea/Germany tested a lot of people, but once they had it under control they only needed to test a sample to determine whether the virus was under control. I'm still a bit surprised by those numbers as when I checked the same site a few months back I thought places like Germany had higher numbers - shame they have no charts for tests over time.
I'll just say that I don't think comparing a large country to a small country makes much sense.
I mean, NYC has more residents than Denmark, Finland, Norway, and Ireland (individually, not combined)
Honestly, we'll never know how those countries would do if everyone moved into a single city and became a world financial center that attracted thousands of visitors from Wuhan, China in December and January... so again I don't think those comparisons are very useful.
Plus, we could also say that many US States which have larger populations than European countries have better overall numbers (less deaths, etc.)
In the end, I think it comes down to where people from Wuhan traveled to.
But if we do want to go just by numbers, then my country is tied for first place! Almost no death's and no new cases in months! ;-)