user: Question: What is the per-capita GDP for the country with an overall GDP of 156.640?
Columns: ['Member countries', 'Population', 'Area (km²)', 'GDP (billion US$)', 'GDP per capita (US$)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Austria', '8,206,524', '83,871', '145.238', '18,048']
SQL:

assistant: SELECT "GDP per capita (US$)" FROM "Table" WHERE "GDP (billion US$)" = '156.640';