Phrasal verb "accounting for"

[Tung Quoc]

Please read:

A/State-owned enterprises led in investment with 1,503 billion USD, accounting for 51/%.

B/The Japanese market accounts for 35% of the company's revenue.

What is the menaing of account for here?
In (A), why accounting for but not accounted for?

Thanks
Quoc

[Conchita]

a) account for sth (BE) phrasal verb
to form the total of something:
Students account for the vast majority of our customers.
(Cambridge Advanced Learner's Dictionary)

b) You can say either 'accounting for' or 'which accounted for'.