Dynamic — something changed
Spot it by: Two or more points in time, on an axis or in the labels.
- Tense cue
- A dated past period takes the past simple. A projected year takes a future form. Mixed frames take the present perfect for the part that is still running.
- Signature language
- rose sharply · climbed to · peaked at · levelled off · fell to · more than halved · fluctuated · overtook · over the same period
- Useful default grouping
- First paragraph: the big movers — start, end, peak.
- Second paragraph: the rest, and the exceptions.
- Use only the figures needed to prove the comparison.
- Use this only when it reflects the figure; otherwise group by the strongest meaningful comparison. Two lines that behave identically may group better by trend than by size.
- The trap
- Listing every value in order. Group by behaviour — up, down, flat — then quote the figures that prove the grouping.
- Overview skeleton
- Overall, [what most items did] over the period, with [the biggest mover] rising fastest and [the exception] the only one to fall.