CREATE TABLE table_64432 ("Fuel gas" TEXT, "Upper index Kcal/ Nm 3" FLOAT, "Lower index Kcal/ Nm 3" FLOAT, "Upper index MJ/ Nm 3" FLOAT, "Lower index MJ/ Nm 3" FLOAT)

What is the average upper index MJ/Nm 3 for the upper index Kcal/Nm 3 entry of 19,376?
SELECT AVG("Upper index MJ/ Nm 3") FROM table_64432 WHERE "Upper index Kcal/ Nm 3" = '19,376'
SELECT AVG("Upper index MJ/ Nm 3") FROM "table_64432" WHERE "Upper index Kcal/ Nm 3" = '19,376'