So I've got this sentence in my IELTS prep book:
The chart shows information about how many people worked from home, in the USA and UK, between 2005 and 2010.
The commas sound so weird. I would be grateful if somebody could explain what are they doing up there.
Actually, the following sentence looks similar but doesn't contain commas:
The chart highlights data about the amount of electricity which was consumed in India and Pakistan between 2004 and 2010.
What is going on?