CREATE TABLE table_37912 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Record" TEXT)

Loss of de la rosa (8 8) has what average attendance?
SELECT AVG("Attendance") FROM table_37912 WHERE "Loss" = 'de la rosa (8–8)'
SELECT AVG("Attendance") FROM "table_37912" WHERE "Loss" = 'de la rosa (8–8)'