4. Mundra

Indian National Congress held the seat; the winning margin widened from 12.6% to 23.1%.

Boundaries were redrawn between 1975 and 1980 — the comparison is matched by name and is indicative only.

• Won on a lower shareIts own vote share fell 5.2% — it held because the rest of the vote was more divided.
• New challengerJanata Party (JNP) finished second with 26.3% — it did not contest here in 1975.
• Vote fragmentedThe top two took only 75.8% between them, down from 96.8% — the field split more ways.

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