Here is the meaning of account for with examples:
Definition1. To explain by relating circumstances; to show that some one, thing or members of a group are present or have been processed.
2. To be the primary cause of
3. To constitute in amount or portion.
Example(s)1. The storekeeper was expected to account for any material removed.
2. The torrential downpour would account for the saturated state of the land.
3. German speakers accounted for 37% of the population.