CREATE TABLE table_25042332_22 (primary__6_13_years_ VARCHAR(255), preschool__0_5_years_ VARCHAR(255))
What is the enrollment ration in primary in the region where the enrollment ratio in preschool is 50.23? 
    
SQL: SELECT primary__6_13_years_ FROM table_25042332_22 WHERE preschool__0_5_years_ = "50.23"