What is the installation date for the Delta Chapter?
CREATE TABLE table_21821014_1 (installation_date VARCHAR, chapter VARCHAR)
SELECT installation_date FROM table_21821014_1 WHERE chapter = "Delta"
### Context: CREATE TABLE table_21821014_1 (installation_date VARCHAR, chapter VARCHAR) ### Question: What is the installation date for the Delta Chapter? ### Answer: SELECT installation_date FROM table_21821014_1 WHERE chapter = "Delta"