Question: In how many countries was the total freshwater withdrawal (km 3 /yr) 169.39?
Schema: create table table_15909409_2 (country varchar, total_freshwater_withdrawal__km_3__yr_ varchar, PRIMARY KEY (country))
SQL: select count(country) from table_15909409_2 where total_freshwater_withdrawal__km_3__yr_ = "169.39"