CREATE TABLE table_25983027_1 (evapotranspiration__km_3__year_ VARCHAR(255), rainfall_by_volume__km_3__year_ VARCHAR(255))
In the region where the rainfall by volume (km 3 /year) was 13.2, what was the evapotranspiration (km 3 /year)?
    
SQL: SELECT evapotranspiration__km_3__year_ FROM table_25983027_1 WHERE rainfall_by_volume__km_3__year_ = "13.2"