03/06/2004 (Agence Europe) - The euro-zone industrial producer price index increased by 0.4% in April 2004 compared with the previous month, according to Eurostat statistics published on 2 June. EU25 prices also grew identically. In April 2004 compared to April 2003, industrial producer prices increased by 1.4% in the euro-zone and by 1.7% in the EU25.