By Scott Murdoch SYDNEY (Reuters) - Australia's sovereign wealth fund, the Future Fund, said on Tuesday its valuation had reached A$252 billion ($166.22 billion) as it pared back its U.S. market exposure to boost investments in Germany and Japan. The fund delivered a 12.2% return in the year ended June 30, which the Future Fund said was double its government-mandated target of 6.1%. The portfolio update for the June quarter published on Tuesday showed the Future Fund now had A$65.13 billion invested in ...