Bella consults

Legends are mostly unnecessary. Instead: right to the data. Look, here it’s for Dollar and percentage signs. And for scale infos.

Source: Wall Street Journal, 2006–11–21, p. C4

Also unnecessary: repetitions. Once a Dollar sign and once a percentage sign is enough.

You can reduce skillfully: 2000, 02, 03 etc.

Reference lines may actually help. If they visually increase the relative deviations. That’s what they do in the middle graph.