The US Dollar's share of forex reserves is currently
increasing.
http://www.reuters.com/article/2012/01/20/uk-markets-forex-uptrend-idUSTRE80J1LH20120120
The International Monetary Fund's Currency Composition of Official Foreign Exchange Reserves data shows the dollar's share of known global currency reserves rose 1.9 percent in the third quarter over the second quarter to 61.7 percent, while the euro's holdings were down 0.9 percent to 25.7 percent from a year earlier.
The dollar comprised 62.1 percent of known reserves as late as the second quarter of 2010 before falling to 60.2 percent in the second quarter of 2011. Now it's again rising, indicating higher dollar demand that will lift the U.S. currency.
"... The U.S. dollar's importance as a reserve currency has been declining for more than a decade. The highest percentage, 70.9 percent, was reached in 1999 as compared to the 2010 level of 61.4 percent. The value of the dollar, as measured by the Dollar Index (DXY), has declined over the same period. The DXY peaked at 121.02
in 2001 when the dollar still made up 70.7 percent of global reserves. The following year the reserve percentage dropped to 66.5 percent and the DXY dropped to 101.80. The decline in the dollar's reserve percentage over the last 11 years from 70.9 percent to 61.4 percent, was mirrored by a decline in the dollar's value as measured by the DXY from 121.02 to 75.63. The moves in the DXY are a multiple of the corresponding moves in the reserve percentage for several reasons; one is that while the reserve number is an absolute percentage, the index reflects the compounding effect of selling the dollar and also buying another currency. Other factors which may distort the relationship between the two measures are the inclusion of gold, SDR's and IMF reserve positions in the reserve totals.
There is a good chance that this trend will continue according to a recent survey of central bank reserve managers, sovereign wealth funds and multilateral institutions. ..." From:
http://www.svb.com/blogs/rgroenveld/central-bank-reserve-diversification/
This is the first hit of Google search on “Percent of central bank reserves held in dollars.” Others tell the same facts. I remember that back in 2008 the dollar was 67% of central bank reserves.
You have “cheery picked” a very unusual three month period when this decade long trend AWAY from holding dollars very slightly reversed.
The reason it did is the same reason the 10 year Treasury bond is paying the least ever: 1.8%.* Namely many including central banks are buying dollars to decrease their exposure to the Euro. The dollar is “the least dirty currency shirt” in the laundry pile now, but definitely not when China makes it possible to hold RMBs in reserves nor as the price of gold climbs, with China's increasing buying and probably not when the RMB is part of the SDR.
* It is insane** to give the Treasury $10,000 for their promise to give you back $180 more after ten years. Even the current rate of inflation will make that a loss in purchasing power, and long before the 10 years is up, inflation probably will be double digits as there is no limit on the FED's printing presses in sight.
** That rate of return is LESS than the average dividend yield on the stocks in the DOW index! AND in 10 years holding them is very likely to double your capital investment to $20,000!