Table:
text: Pilibhit (Lok Sabha constituency)
Members of Parliament
Members of Parliament
Year_ Lok_Sabha Members_of_Parliament Party_Won Winner_s_votes Trailing_Party Trailing_Party_votes
1951 1st Lok Sabha Mukund Lal Agrawal Indian National Congress 43.11% Socialist Party 22.58%
1957 2nd Lok Sabha Mohan Swarup Praja Socialist Party 50.54% Indian National Congress 34.86%
1962 3rd Lok Sabha Mohan Swarup Praja Socialist Party 29.62% Indian National Congress 27.42%
1967 4th Lok Sabha Mohan Swarup Praja Socialist Party 28.24% Indian National Congress 24.26%
1971 5th Lok Sabha Mohan Swarup Indian National Congress 38.96% Indian National Organization 24.74%
1977 6th Lok Sabha Md Shamsul Hasan Khan Bharatiya Lok Dal 71.32% Indian National Congress 19.73%
1980 7th Lok Sabha Harish Kumar Gangawar Indian National Congress 40.42% Janata Party 25.34%

Question: What is the lowest year when Lok Sabha is "4th Lok Sabha" under Pilibhit (Lok Sabha constituency)?

Question: What are MPs if the winner's % vote in Pilibhit Lok Sabha constituency is "50.54%"?