SELECT ROUND(AVG(TOTAL_VALUE)) AS SA_MEDIAN
FROM (SELECT C1.TOTAL_VALUE
FROM CONVENIENCE AS C1 CROSS JOIN CONVENIENCE AS C2
WHERE C1.SURVEY_YEAR = 2019
AND C1.KIND_CODE = '100'
GROUP BY C1.TOTAL_VALUE
HAVING SUM(CASE WHEN C1.TOTAL_VALUE >= C2.TOTAL_VALUE
           THEN 1
           ELSE 0 END) >= COUNT(*)/2
AND SUM(CASE WHEN C1.TOTAL_VALUE <= C2.TOTAL_VALUE
           THEN 1
           ELSE 0 END) >= COUNT(*)/2)