CREATE TABLE table_66080 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What is the lowest week that has 51,499 as the attendance?
SELECT MIN("Week") FROM table_66080 WHERE "Attendance" = '51,499'
SELECT MIN("Week") FROM "table_66080" WHERE "Attendance" = '51,499'