You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
European_Central_Bank

Context:
José Manuel González-Páramo, a Spanish member of the Executive Board since June 2004, was due to leave the board in early June 2012 and no replacement had been named as of late May 2012. The Spanish had nominated Barcelona-born Antonio Sáinz de Vicuña, an ECB veteran who heads its legal department, as González-Páramo's replacement as early as January 2012 but alternatives from Luxembourg, Finland, and Slovenia were put forward and no decision made by May. After a long political battle, Luxembourg's Yves Mersch, was appointed as González-Páramo's replacement.

Question:
When did González-Páramo take his seat on the Executive Board?

June 2004