You'll often see this in business articles: The total export netted 222.1 billion dollars. "To net" means "to bring in or yield as profit".

You could say "ammounted to". Attained and achieved sound a little strange to me in this context. And I might rephrase the sentence to say "The total value in exports reached 221.1 billion dollars" - that just sounds a little more specific and clear.

'Attained' definitely wouldn't work. 'Achieved' would also be very odd, since that word typically refers to the accomplishment of an agent (i.e. a human), and an export doesn't have agency. I suppose you could say, "The export totalled 222.1 billion dollars," or, "The total export amounted to 222.1 billion dollars," but for all intents and purposes, the sentence you wrote works. It's by far the most common variation of the sentence, and even the alternatives I wrote are pretty awkward. Stick with 'reached', in my opinion.