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March 3, 1863 .06 (.03 per half ounce)
March 3, 1883 .04 (.02 per half ounce)
July 1, 1885 .02
November 2,1917 .03 War Years
July 1, 1919 .02 Dropped back by Congress
July 1, 1928 .02
July 6, 1932 .03 Great Depression
January 1, 1952 .03
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August 1, 1958 .04 End of Fiscal Responsibility
January 7, 1963 .05
January 7, 1968 .06
May 16, 1971 .08 Nixon Gold Shock
March 2, 1974 .10
September14,1975 .10 Last surface mail rate
December 31,1975 .13 All domestic first class & postcards by airmail
May 29, 1978 .15 A Stamp Used
March 22, 1981 .18 B Stamp Used
November 1, 1981 .20 C Stamp Used
February 17,1985 .22 D Stamp Used
April 3, 1988 .25 E Stamp Used
February 3,1991 .29 F Stamp Used (also 4 cent F makeup rate stamp)
January 1, 1995 .32 G Stamp Used (also 3 cent G makeup rate stamp)
January 10,1999 .33 H Stamp Used (also 1 cent H makeup rate stamp)
January 7, 2001 .34 Nondenominated Stamps Used
July 1, 2001 .34 Nondenominated Stamps Used
June 30, 2002 .37 Flag and Antique Toy Stamps Used
January 8, 2006 .39 Lady Liberty Flag Stamp Used
May 14, 2007 .41 Shape-based postage pricing introduced; Forever stamps introduced; different prices for letters and packages for the first time
May 12, 2008 .42 Price change announced February 11, 2008
May 11, 2009 .44 Price change announced February 10, 2009 / Obamo
April 17, 2011 .44 [3]
January22,2012 .45
January27,2013 .46 Price change announced October 11, 2012
January26,2014 .49
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http://en.wikipedia.org/wiki/History_of_United_States_postage_rates#Historical_rates