Hyundai Motor India Ltd has become the country's fifth most valuable auto firm by market valuation in its debut trade on Tuesday.Shares of Hyundai Motor India Ltd, the Indian arm of South Korean automaker Hyundai, listed at Rs 1,931, reflecting a decline of 1.47 per cent against the issue price of Rs 1,960 on the BSE earlier in the day.The stock slumped 7.80 per cent to Rs 1,807.05 during the day and finally ended at Rs 1,820.40 apiece, down 7.12 per cent.