Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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 )

### Question ###
What are all percentages of Left Block when there is a 28.7% Social Democratic?

### Accurate SQL ###

SELECT "Left Bloc" FROM table_19477 WHERE "Social Democratic" = '28.7%'