CREATE TABLE table_16098 ("Week" FLOAT, "Date" TEXT, "Kickoff" TEXT, "Opponent" TEXT, "Final score" TEXT, "Team record" TEXT, "Game site" TEXT, "Attendance" FLOAT)

In what week was the first game played at the Commerzbank-Arena?
SELECT MIN("Week") FROM table_16098 WHERE "Game site" = 'Commerzbank-Arena'
SELECT MIN("Week") FROM "table_16098" WHERE "Game site" = 'Commerzbank-Arena'