What is the percentage of under $500 thefts among all cases that happened in West Englewood?
under $500 refers to secondary_description = '$500 AND UNDER'; theft refers to primary_description = 'THEFT'; West Englewood refers to community_area_name = 'West Englewood'; percentage = divide(count(case_number where secondary_description = '$500 AND UNDER'), count(case_number)) where primary_description = 'THEFT' and community_area_name = 'West Englewood' * 100%
SELECT CAST(SUM(CASE WHEN T2.secondary_description = '$500 AND UNDER' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.case_number) FROM Crime AS T1 INNER JOIN IUCR AS T2 ON T1.iucr_no = T2.iucr_no INNER JOIN Community_Area AS T3 ON T1.community_area_no = T3.community_area_no WHERE T2.primary_description = 'THEFT' AND T3.community_area_name = 'West Englewood'