ปีแรกสุดสำหรับ Ligier Gitanes คือปีใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What was the earliest year for the Ligier Gitanes?It is not neccessary to use all the tables.
 table_68427:  "Year" [ real]  "Entrant" [ text]  "Chassis" [ text]  "Engine" [ text]  "Points" [ real] 
SELECT MIN("Year") FROM table_68427 WHERE "Entrant" = 'ligier gitanes'