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The dollar (currency code USD) is the unit of currency of the United States. It is normally abbreviated as the dollar sign, $, or as USD or US$ to distinguish it from other dollar-denominated currencies and from others that use the $ symbol. The U.S. dollar is divided into 100 cents.Adopted by the United States on July 6, 1785, the U.S. dollar is the currency most used in international transactions. Several countries use the U.S. dollar as their official currency, and many others allow it to be used in a de facto capacity. In 1995, over US $380 billion were in circulation, two-thirds of which was outside the United States. By 2005, that figure had doubled to nearly $760 billion, with an estimated half to two-thirds being held overseas, representing an annual growth rate of about 7.6%. However, as of December 2006, the dollar was surpassed by the Euro in terms of combined value of cash in circulation. The value of Euro notes in circulation had risen to more than €610 billion, equivalent to US$802 billion at the exchange rates at the time.The first dollar coins issued by the United States Mint were of the same size and composition as the Spanish dollar and even after the American Revolutionary War the Spanish and U.S. silver dollars circulated side by side in the United States. The coinage of various English colonies also circulated. The lion dollar was popular in the Dutch New Netherland Colony (New York), but the lion dollar also circulated throughout the English colonies during the Seventeenth and early Eighteenth centuries. Examples circulating in the colonies were usually fairly well worn so that the design was not fully distinguishable, thus they were sometimes referred to as "dog dollars".Private banks issued currency backed by Spanish and U.S. silver and gold coinage, although the federal government did not do so until the American Civil War.The U.S. dollar was originally specified by the Coinage Act of 1792 to be a unit of weight (471.25 grains of troy silver (about 30.54 g of silver)) and not one of money as it is thought of today. The value of gold or silver contained in the dollar was then converted into relative value in the economy for the buying and selling of goods. This allowed the value of things to remain fairly constant over time, except for the influx and outflux of gold and silver in the nation's economy. According to an evaluation of data from the U.S. Department of Treasury, the cost of goods and services remained relatively consistent between 1635 and 1913, around a level of roughly 25 times the buying power of the U.S. dollar in 2006Silver and gold standardsFrom 1792, when the Mint Act was passed, the dollar was pegged to silver and gold at 371.25 grains of silver, 24.75 grains of gold (15:1 ratio). 1834 saw a shift in the gold standard to 23.2 grains, followed by a slight adjustment to 23.22 grains in 1837 (16:1 ratio).In 1862, paper money was issued without the backing of precious metals, due to the Civil War. Silver and gold coins continued to be issued and in 1878 the link between paper money and coins was reinstated. This disconnect from gold and silver backing also occurred during the war of 1812. The use of paper money not backed by precious metals had occurred under the Articles of Confederation from 1777 to 1788 when paper money became referred to as "not worth a continental". This was a primary reason for the "no state shall require anything but gold and silver as tender in payment of debt" clause of the Constitution.In 1900, the bimetallic standard was abandoned and the dollar was defined as 23.22 grains of gold, equivalent to setting the price of 1 troy ounce of gold at $20.67. Silver coins continued to be issued for circulation until 1964, when all silver was removed from dimes and quarters, and the half dollar was reduced to 40% silver. Silver half dollars were last issued for circulation in 1969.Gold coins were withdrawn in 1933 and the gold standard was changed to 13.71 grains, equivalent to setting the price of 1 troy ounce of gold at $35. This standard persisted until 1968. Between 1968 and 1975, a variety of pegs to gold were put in place. The price was at $42.22 per ounce before January 1, 1975 saw the U.S. dollar freely float on currency markets.According to the Bureau of Printing and Engraving, the largest note it ever printed was the $100,000 Gold Certificate, Series 1934. These notes were printed from 18 December 1934 through 9 January 1935, and were issued by the Treasurer of the United States to Federal Reserve Banks only against an equal amount of gold bullion held by the Treasury. These notes were used for transactions between Federal Reserve Banks and were not circulated among the general public.