Table schema:
CREATE TABLE table_15909409_2 (total_freshwater_withdrawal__km_3__yr_ VARCHAR, agricultural_use__m_3__p_yr__in__percentage_ VARCHAR)

Question: How many countries had a total freshwater withdrawal (km 3 /yr) where the agricultural use (m 3 /p/yr)(in %) was 428(62%)?
SQL: SELECT COUNT(total_freshwater_withdrawal__km_3__yr_) FROM table_15909409_2 WHERE agricultural_use__m_3__p_yr__in__percentage_ = "428(62%)"