user: Question: When is the earliest year with a Power of 90kW (121hp) @ 4000?
Columns: ['Engine', 'Displacement', 'Power', 'Torque', 'Year']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['M47D20', '2.0L (1951cc/119in³)', '100kW (134hp) @ 4000', '280N·m (207lb·ft) @ 1750', 1998.0]
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "Power" = '90kW (121hp) @ 4000';