What are all percentages of Left Block when there is a 28.7% Social Democratic?
CREATE TABLE table_19477 (
    "Date Released" text,
    "Polling institute" text,
    "Socialist" text,
    "Social Democratic" text,
    "Peoples Party" text,
    "Green-Communist" text,
    "Left Bloc" text,
    "Lead" text
)
SELECT "Left Bloc" FROM table_19477 WHERE "Social Democratic" = '28.7%'
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 are all percentages of Left Block when there is a 28.7% Social Democratic? ### Input: CREATE TABLE table_19477 (
    "Date Released" text,
    "Polling institute" text,
    "Socialist" text,
    "Social Democratic" text,
    "Peoples Party" text,
    "Green-Communist" text,
    "Left Bloc" text,
    "Lead" text
) ### Response: SELECT "Left Bloc" FROM table_19477 WHERE "Social Democratic" = '28.7%'