CREATE TABLE table_204_872 (id NUMBER, "name" CLOB, "completed" CLOB, "architect" CLOB, "location" CLOB, "year of listing & ref ( s ) " NUMBER)

which year has the most buildings listed ?
SELECT "year of listing & ref(s)" FROM table_204_872 GROUP BY "year of listing & ref(s)" ORDER BY COUNT("name") DESC LIMIT 1
SELECT "year of listing & ref(s)" FROM "table_204_872" GROUP BY "year of listing & ref(s)" ORDER BY COUNT("name") DESC FETCH FIRST 1 ROWS ONLY