Table schema:
CREATE TABLE table_30133_1 (current_account_balance__percent_of_gdp_ VARCHAR, gdp_at_current_prices__usd_billions_ VARCHAR)

Question: What is the current account balance for a GDP at current prices of 142.640?
SQL: SELECT current_account_balance__percent_of_gdp_ FROM table_30133_1 WHERE gdp_at_current_prices__usd_billions_ = "142.640"