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The trend is likely to continue as oil prices stay low and growth in emerging markets remains weak, reducing the dollar inflows that central banks used to build reserves, according to Deutsche Bank AG.     Such a development is detrimental to the euro, which had benefited from purchases in recent years by central banks seeking to diversify their reserves, according to George Saravelos, co-head of foreign-exchange research at Deutsche Bank.     The euro’s share of global reserves dropped to 22 percent in 2014, the lowest since 2002, while the dollar’s rose to a five-year high of 63 percent, the International Monetary Fund reported March 31.     “The Middle East and China stand out as two regions that are likely to face ongoing pressures to run down reserves over the next few years,” Saravelos wrote in a note. The central banks there “need to sell euros,” he said.     The euro has declined against 29 of 31 major currencies this year as the European Central Bank stepped up monetary stimulus to avert deflation. The currency tumbled to a 12-year low of $1.0458 on March 16, before rebounding to $1.0990...