CREATE TABLE table_30893 ("Number" CLOB, "Serial Number" FLOAT, "Into Service" CLOB, "Withdrawn" CLOB, "Scrapped" CLOB)

Name the number for 2004 scapped
SELECT "Number" FROM table_30893 WHERE "Scrapped" = '2004'
SELECT "Number" FROM "table_30893" WHERE "Scrapped" = '2004'