ตั้งชื่อปีเฉลี่ยด้วยรอบ 6 ไม่จำเป็นต้องใช้ตารางทั้งหมด
Name the average year with Laps of 6It is not neccessary to use all the tables.
 table_68313:  "Year" [ real]  "Class" [ text]  "Tyres" [ text]  "Team" [ text]  "Co-Drivers" [ text]  "Laps" [ real]  "Pos." [ text] 
SELECT AVG("Year") FROM table_68313 WHERE "Laps" = '6'