user: Question: What is the current account balance for an export volume of goods and service value of -4.2?
Columns: ['Year', 'GDP at constant prices (THB trillions)', 'GDP at constant prices growth rate (percent change)', 'GDP at current prices (USD billions)', 'Export volume of goods and services (percent change)', 'Current account balance (percent of GDP)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1995.0, '2.941', '9.2', '168.019', '15.4', '-7.9']
SQL:

assistant: SELECT "Current account balance (percent of GDP)" FROM "Table" WHERE "Export volume of goods and services (percent change)" = '-4.2';