When is the total return equal to the income and capital sum?

First in Shwerser by looking at the calculations I understood that in each quarter the Income return and capital return were equal to the total return, however the annual total return is not equal to the sum as the annual income and capital return are geometricaaly linked.

Then when reading the presentation and reporting part, they say: “in addition to the total return, the capital return and income return components must be disclosed, must sum to total return, and must be clearly identified as gross or net”.

Do they mean the quarterly return in this statement?

They also say: “Prior to 2011, if component returns are adjusted so that the sum of the income and capital returns equals the total return”. Do they mean here the annual return?

Confusing!