Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_1463383_1 (left_bloc VARCHAR, social_democratic VARCHAR)
### Question:
What are all percentages of Left Block when there is a 28.7% Social Democratic?
### Answer:
SELECT left_bloc FROM table_1463383_1 WHERE social_democratic = "28.7%"