Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the average upper index MJ/Nm 3 for the upper index Kcal/Nm 3 entry of 19,376?

### Inputs:
table_name: table, columns: ['Fuel gas', 'Upper index Kcal/ Nm 3', 'Lower index Kcal/ Nm 3', 'Upper index MJ/ Nm 3', 'Lower index MJ/ Nm 3']

### Response:
SELECT AVG Upper index MJ/ Nm 3 FROM table WHERE Upper index Kcal/ Nm 3 = 19,376