What is the enrollment for the institution that joined in 1987? 
CREATE TABLE table_2562113_1 (enrollment INTEGER, joined VARCHAR)
SELECT MIN(enrollment) FROM table_2562113_1 WHERE joined = 1987
### Context: CREATE TABLE table_2562113_1 (enrollment INTEGER, joined VARCHAR) ### Question: What is the enrollment for the institution that joined in 1987?  ### Answer: SELECT MIN(enrollment) FROM table_2562113_1 WHERE joined = 1987