What was the date that construction was finished when the unit was greifswald - 4 (kgr 4)?
CREATE TABLE table_15563 (
    "Unit" text,
    "Type" text,
    "Net Power" text,
    "Total Power" text,
    "Finish construction" text
)
SELECT "Finish construction" FROM table_15563 WHERE "Unit" = 'greifswald - 4 (kgr 4)'
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 date that construction was finished when the unit was greifswald - 4 (kgr 4)? ### Input: CREATE TABLE table_15563 (
    "Unit" text,
    "Type" text,
    "Net Power" text,
    "Total Power" text,
    "Finish construction" text
) ### Response: SELECT "Finish construction" FROM table_15563 WHERE "Unit" = 'greifswald - 4 (kgr 4)'