SELECT ROUND(AVG(TOTAL_VALUE))
  FROM (
		SELECT TOTAL_VALUE
		  FROM (
				SELECT SURVEY_YEAR
				      ,TOTAL_VALUE
				  FROM CONVENIENCE
				 WHERE SURVEY_YEAR = '2019'
				   AND KIND_CODE = '100'
				)
		 ORDER BY TOTAL_VALUE LIMIT 2 - (
				SELECT COUNT(*) 
				  FROM (
						SELECT SURVEY_YEAR
						      ,TOTAL_VALUE
						  FROM CONVENIENCE
						 WHERE SURVEY_YEAR = '2019'
						   AND KIND_CODE = '100'
						)
			)% 2 OFFSET(
					SELECT (COUNT(*) - 1) / 2
					  FROM (
							SELECT SURVEY_YEAR
							      ,TOTAL_VALUE
							  FROM CONVENIENCE
							 WHERE SURVEY_YEAR = '2019'
							   AND KIND_CODE = '100'
							)
					)
		)