Milan, April 15 - Just under nine billion euros in new Italian inflation-linked bonds were sold Monday amid unexpectedly strong demand. The exact figure was 8.984 billion euros. The Italian Treasury said that the new bonds, bearing a minimum return of 2.25%, went so quickly that their sales might end early. The sale of the four-year bond had been slated to end on Thursday. Within the first 90 minutes of the bonds going on sale, almost three billion euros worth of the paper had been sold.