CREATE TABLE table_13560 ("Year" CLOB, "1851" CLOB, "1861" CLOB, "1871" CLOB, "1881" CLOB)

What's the year when 1851 had 634?
SELECT "Year" FROM table_13560 WHERE "1851" = '634'
SELECT "Year" FROM "table_13560" WHERE "1851" = '634'