CREATE TABLE table_71549 ("Year" FLOAT, "Team" TEXT, "Co-Drivers" TEXT, "Class" TEXT, "Laps" FLOAT, "Pos." TEXT, "Class Pos." TEXT)

What year did finish 1st in LMP1 class?
SELECT AVG("Year") FROM table_71549 WHERE "Class" = 'lmp1' AND "Class Pos." = '1st'
SELECT AVG("Year") FROM "table_71549" WHERE "Class Pos." = '1st' AND "Class" = 'lmp1'