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

### Instruction:
What is the per-capita GDP for the country with an overall GDP of 156.640?

### Inputs:
table_name: table, columns: ['Member countries', 'Population', 'Area (km²)', 'GDP (billion US$)', 'GDP per capita (US$)']

### Response:
SELECT GDP per capita (US$) FROM table WHERE GDP (billion US$) = 156.640