CREATE TABLE table_4302 ("Year" FLOAT, "GDP at constant prices  ( THB trillions ) " TEXT, "GDP at constant prices growth rate  ( percent change ) " TEXT, "GDP at current prices  ( USD billions ) " TEXT, "Export volume of goods and services  ( percent change ) " TEXT, "Current account balance  ( percent of GDP ) " TEXT)

What is the current account balance for an export volume of goods and service value of -4.2?
SELECT "Current account balance (percent of GDP)" FROM table_4302 WHERE "Export volume of goods and services (percent change)" = '-4.2'
SELECT "Current account balance (percent of GDP)" FROM "table_4302" WHERE "Export volume of goods and services (percent change)" = '-4.2'