For how many years has the Mercury Prize been awarded?
CREATE TABLE table_name_71 (year VARCHAR, award VARCHAR)
SELECT COUNT(year) FROM table_name_71 WHERE award = "mercury prize"
### Context: CREATE TABLE table_name_71 (year VARCHAR, award VARCHAR) ### Question: For how many years has the Mercury Prize been awarded? ### Answer: SELECT COUNT(year) FROM table_name_71 WHERE award = "mercury prize"