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

### Instruction:
What is the average area in square miles for the hunan administrative division with a national share less than 2.19%?

### Inputs:
table_name: table, columns: ['Rank', 'Administrative Division', 'Area (km²)', 'Area (sq mi)', 'National Share (%)', 'Comparable Country']

### Response:
SELECT AVG Area (sq mi) FROM table WHERE Administrative Division = hunan AND National Share (%) < 2.19