 Complete the following phrase:  On 8 May 1985, American President Ronald Reagan dined in the Palace and signed the official Strasbourg guestbook, on the occasion of his visit to the European Parliament. In December 1989, the Palais Rohan hosted the dinner parties of the heads of state of the European Council, including François Mitterrand, Helmut Kohl, Margaret Thatcher, Giulio Andreotti and Felipe González. Twenty years later, before the 