2 Hong Kong (SAR) 254.40
3 Monaco 242.89
4 Switzerland 222.00
5 Thailand 221.00
6 Romania 217.91
7 South Korea 216.67
8 Denmark 216.13
9 Chile 209.83
10 France 201.61
11 Hungary 201.55
12 United States 199.00
First of all, Singapore, Hong Kong and Monaco really can't be compared to the US. Two of them are wealthy city-states and Monaco is very small (and wealthy).
Once you get to #4 Switzerland, the difference is negligible. The difference between a 200mbps connection and 222 is barely noticeable. It's more than enough to stream movies and use the internet at home, and it's way too slow if you are running a large tech heavy operation. But if you are in the latter group, chances are you aren't doing it at home and much faster commercial broadband of 1GB+ is readily available in most major cities. And if you are like most places, you probably do most of your heavy lifting in data centers belonging to Msft/google/amazon, where the internet speeds are significantly faster.
It seems to me that the important metric is not average speed, but % of people with, say, reliable connections of 50mbps or faster. That's probably how much you need for reasonable home usage with with a few TVs streaming. I don't think most people will notice the difference beyond that.