Forex reserves have been falling at Asian banks as they have attempted - not so successfully - to bolster their weakening currencies, which have been suffering partly from the Fed's talk of tapering. Six out of the 10 banks with the largest holdings have cut their reserves this year.
The Bank of Indonesia's holdings have plunged a record 18% in 2013, while the rupiah has dropped 12%. The Reserve Bank of India's holdings have fallen 4% as the rupee has dropped 12%.
The trends threaten currencies that central banks bought as they looked to diversify their reserves beyond the U.S. dollar in past years, including the euro, the Swedish krona, the Norwegian krone, the South Korean won, and the Australian and Canadian dollars.