CREATE TABLE table_3521 ("Institution" TEXT, "Location" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Nickname" TEXT, "Joined" TEXT, "Left" TEXT, "Current Conference" TEXT)

What is the enrollment for the institution nicknamed the panthers that left in 2012?
SELECT "Enrollment" FROM table_3521 WHERE "Left" = '2012' AND "Nickname" = 'Panthers'
SELECT "Enrollment" FROM "table_3521" WHERE "Left" = '2012' AND "Nickname" = 'Panthers'