Question: How many countries has a gdp (nominal) of $29.9 billion?
Schema: create table table_11780179_1 (gdp_per_capita__nominal_ varchar, gdp__nominal_ varchar, PRIMARY KEY (gdp_per_capita__nominal_))
SQL: select count(gdp_per_capita__nominal_) from table_11780179_1 where gdp__nominal_ = "$29.9 billion"