In how many countries was the total freshwater withdrawal (km 3 /yr) 169.39?
CREATE TABLE "freshwater_withdrawal_by_country_and_sec" (
  "country" text,
  "total_freshwater_withdrawal_km_3_yr" text,
  "per_capita_withdrawal_m_3_p_yr" real,
  "domestic_use_m_3_p_yr_in_pct" text,
  "industrial_use_m_3_p_yr_in_pct" text,
  "agricultural_use_m_3_p_yr_in_pct" text
);
SELECT COUNT("country") FROM "freshwater_withdrawal_by_country_and_sec" WHERE "total_freshwater_withdrawal_km_3_yr"='169.39';