ทีมสหรัฐอเมริกาชนะโดยเฉลี่ยกี่ครั้ง?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many average wins have USA as the team?It is not neccessary to use all the tables.
 table_42434:  "Pos." [ real]  "Team" [ text]  "Wins" [ real]  "Ties" [ real]  "Losses" [ real]  "Goals" [ text]  "Diff." [ text]  "Points" [ text] 
SELECT AVG("Wins") FROM table_42434 WHERE "Team" = 'usa'