CREATE TABLE table_47240 ("1998" CLOB, "2000" CLOB, "2004" CLOB, "2007" CLOB, "2011" CLOB)

What is the 1998 value if the 2011 value is 30.4?
SELECT "1998" FROM table_47240 WHERE "2011" = '30.4'
SELECT "1998" FROM "table_47240" WHERE "2011" = '30.4'