CREATE TABLE table_36559 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What was the average week for the gaime against the philadelphia eagles with less than 31,066 in attendance?
SELECT AVG("Week") FROM table_36559 WHERE "Opponent" = 'philadelphia eagles' AND "Attendance" < '31,066'
SELECT AVG("Week") FROM "table_36559" WHERE "Attendance" < '31,066' AND "Opponent" = 'philadelphia eagles'