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A tax year in one place
Realised gains, dividend income, the rates actually used, and the files — for one calendar year.
One page per calendar year: gains, income, the exchange rates that were applied, and three exports already narrowed to that year.
Calendar year, which is not everyone's tax year
The UK tax year starts 6 April, Australia's on 1 July, India's on 1 April. The window here is January to December, said at the top of the page rather than in a footnote, because every figure below it is measured that way.
Lots are matched across the whole history first and narrowed to the year afterwards — the same rule the gains page follows, for the same reason.