The webapp provides for each item the link on ECB's website.
Speeches for : Lucas Papademos, Jean-Claude Trichet where "improve" appeared
2010-01-14 : Introductory statement with Q&A2009-11-05 : Introductory statement with the Q&A
2005-06-02 : Introductory statement with Q&A
2004-09-02 : Introductory statement with Q&A
2004-04-01 : Introductory statement with Q&A