user: Question: What is the average upper index MJ/Nm 3 for the upper index Kcal/Nm 3 entry of 19376?
Columns: ['Fuel gas', 'Upper index Kcal/ Nm 3', 'Lower index Kcal/ Nm 3', 'Upper index MJ/ Nm 3', 'Lower index MJ/ Nm 3']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Hydrogen', 11528.0, 9715.0, 48.23, 40.65]
SQL:

assistant: SELECT AVG("Upper index MJ/ Nm 3") FROM "Table" WHERE "Upper index Kcal/ Nm 3" = 19376.0;