pass with an 85% majority. All IMF member countries are represented in the XDR Department, but this is not a one country, one vote system; voting power is determined by a member country's IMF quota. For example, the United States has 16.7% of the vote as of March 2, 2011. Allocations are not made on a regular basis and have only occurred on rare occasions. The first round took place because of a situation that was soon reversed, the possibility of an insufficient amount of U.S. dollars because of U.S. reluctance to run the deficit necessary to supply future demand. Extraordinary circumstances have, likewise, led to the other XDR allocation events. For example, during the global financial crisis of 2009, XDR 182.6 billion was allocated to "provide liquidity to the global economic system and supplement member countries’ official reserves". The 2011 allocations were to low-income member countries. Exchange An IMF member country that requires actual foreign currency may sell its SDRs to another member country in exchange for the currency. To sell a part or all its SDRs, the country must find a willing party to buy them. The IMF acts as an intermediary in this voluntary exchange. The IMF also has the authority under the designation mechanism to ask member countries with strong foreign exchange reserves to purchase XDRs from those with weak reserves. The maximum obligation any country has under this mechanism is currently equal to twice the amount of its SDR allocation. As of 2015, XDRs may only be exchanged for euros, Japanese yen, UK pounds, or US dollars. The IMF says exchanging XDRs can take "several days." It is not, however, the IMF that pays out foreign currency in exchange for XDRs: the claim to currency that XDRs represent is not a claim on the IMF. Interest rate The IMF calculates a weekly interest rate, which is based on "a weighted average of representative interest rates on short-term debt in the money markets of the XDR basket currencies". No interest is payable on the SDRs allocated to a country by the IMF. However, interest is payable by an IMF member country that has exchanged (sold) some or all of the SDRs it was allocated, and interest is paid to a member country that holds more SDRs than it was allocated (i.e., the country that bought SDRs from another member). Other uses The XDR is used in