<Tr> <Td> May 31, 2015 </Td> <Td>. 49 </Td> <Td> 2.54 (3 oz) </Td> <Td>. 22 (letters). 20 (packages) </Td> <Td>. 35 </Td> <Td> </Td> </Tr> <Tr> <Td> April 10, 2016 </Td> <Td>. 47 </Td> <Td> 2.54 (3 oz) </Td> <Td>. 21 (letters). 20 (packages) </Td> <Td>. 34 </Td> <Td> Price change announced February 25, 2016 </Td> </Tr> <Tr> <Td> January 22, 2017 </Td> <Td>. 49 </Td> <Td> 2.67 (3 oz) </Td> <Td>. 21 (letters). 18 (packages) </Td> <Td>. 34 </Td> <Td> Price change announced October 12, 2016 </Td> </Tr> <P> Taking the above data and plotting it yields the graph shown to the right . The dark plot is the nominal issued price of the stamp and the light plot is the price adjusted for inflation and is shown in 2016 US cents . </P>

When was the last time postage stamps went up