386. Siana

Praja Socialist Party held the seat; the winning margin narrowed from 6.0% to 1.9%.

Boundaries were redrawn between 1962 and 1967 — the comparison is matched by name and is indicative only.

• Won on a lower shareIts own vote share fell 14.3% — it held because the rest of the vote was more divided.
• Vote fragmentedThe top two took only 65.4% between them, down from 89.8% — the field split more ways.

Written from the constituency figures by a fixed set of rules — no language model.