CREATE TABLE table_204_257 (id DECIMAL, "ethnicity" TEXT, "1926 census" TEXT, "1939 census" TEXT, "1959 census" TEXT, "1970 census" TEXT, "1979 census" TEXT, "1989 census" TEXT, "2007 estimate" TEXT)

who is previous of the russians based on the list ?
SELECT "ethnicity" FROM table_204_257 WHERE id = (SELECT id FROM table_204_257 WHERE "ethnicity" = 'russians') - 1
SELECT "ethnicity" FROM "table_204_257" WHERE "id" = (SELECT "id" FROM "table_204_257" WHERE "ethnicity" = 'russians') - 1