CREATE TABLE table_203_661 (id DECIMAL, "year" DECIMAL, "single" TEXT, "peak chart positions\ us mod" DECIMAL, "peak chart positions\ uk" DECIMAL, "album" TEXT)

which year has the most singles ?
SELECT "year" FROM table_203_661 GROUP BY "year" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "year" FROM "table_203_661" GROUP BY "year" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1