What is the current account balance for a GDP at current prices of 142.640?
create table table_30133_1 (current_account_balance__percent_of_gdp_ varchar, gdp_at_current_prices__usd_billions_ varchar, PRIMARY KEY (current_account_balance__percent_of_gdp_))
select current_account_balance__percent_of_gdp_ from table_30133_1 where gdp_at_current_prices__usd_billions_ = "142.640"