user: Question: If the assembly is the Sixth Assembly, what is the maximum election year?
Columns: ['Election Year', 'Assembly', 'Winning Party/Coalition', 'Chief Minister', 'Speaker']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1952.0, 'First Assembly', 'Indian National Congress *', 'C. Rajagopalachari K. Kamaraj', 'J. Shivashanmugam Pillai (2)']
SQL:

assistant: SELECT MAX("Election Year") FROM "Table" WHERE "Assembly" = 'Sixth Assembly';