user: Question: In what year did Hougang United finish in 4th place?
Columns: ['Year', 'Champions', 'Runners-up', 'Score in the final', '3rd-place', '4th-place']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1998.0, 'Tanjong Pagar United', 'Singapore Armed Forces', '2–0', 'Home United', 'Sembawang Rangers']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "4th-place" = 'Hougang United';