Qual é o PIB a preços constantes para um saldo da conta corrente de 12,8?
CREATE TABLE table_30133_1 (gdp_at_constant_prices__thb_trillions_ VARCHAR, current_account_balance__percent_of_gdp_ VARCHAR)
SELECT gdp_at_constant_prices__thb_trillions_ FROM table_30133_1 WHERE current_account_balance__percent_of_gdp_ = "12.8"