What is the current account balance for an export volume of goods and service value of -4.2?
create table table_30133_1 (current_account_balance__percent_of_gdp_ varchar, export_volume_of_goods_and_services__percent_change_ varchar, PRIMARY KEY (current_account_balance__percent_of_gdp_))
select current_account_balance__percent_of_gdp_ from table_30133_1 where export_volume_of_goods_and_services__percent_change_ = "-4.2"