what was the top thrust achieved by a lyul ` ka engine before 1980 ?
CREATE TABLE table_203_823 (
    id number,
    "model name" text,
    "date" text,
    "type" text,
    "thrust (kg) / power (eshp)" text,
    "fitted to" text
)
SELECT "thrust (kg) / power (eshp)" FROM table_203_823 ORDER BY "thrust (kg) / power (eshp)" DESC LIMIT 1
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what was the top thrust achieved by a lyul ` ka engine before 1980 ? ### Input: CREATE TABLE table_203_823 (
    id number,
    "model name" text,
    "date" text,
    "type" text,
    "thrust (kg) / power (eshp)" text,
    "fitted to" text
) ### Response: SELECT "thrust (kg) / power (eshp)" FROM table_203_823 ORDER BY "thrust (kg) / power (eshp)" DESC LIMIT 1