What was the country in which the agricultural use (m 3 /p/yr)(in %) was 794(86%)?
create table table_15909409_2 (country varchar, agricultural_use__m_3__p_yr__in__percentage_ varchar, PRIMARY KEY (country))
select country from table_15909409_2 where agricultural_use__m_3__p_yr__in__percentage_ = "794(86%)"