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Table 5. Chained Consumer Price Index for All Urban Consumers (C-CPI-U) and the Consumer Price Index for All Urban Consumers (CPI-U): U.S. city average, all items index, August 2018 [Percent changes] Month Year Unadjusted 1-month percent change Unadjusted 12-month percent change C-CPI-U1 CPI-U C-CPI-U 1 CPI-U December 2000............................. 2.6 3.4 December 2001............................. 1.3 1.6 December 2002............................. 2.0 2.4 December 2003............................. 1.7 1.9 December 2004............................. 3.2 3.3 December 2005............................. 2.9 3.4 December 2006............................. 2.3 2.5 December 2007............................. 3.7 4.1 December 2008............................. 0.2 0.1 December 2009............................. 2.5 2.7 December 2010............................. 1.3 1.5 December 2011............................. 2.9 3.0 December 2012............................. 1.5 1.7 December 2013............................. 1.3 1.5 December 2014............................. 0.5 0.8 December 2015............................. 0.4 0.7 January 2016............................... 0.1 0.2 1.1 1.4 February 2016.............................. 0.0 0.1 0.7 1.0 March 2016.................................. 0.5 0.4 0.5 0.9 April 2016.................................... 0.5 0.5 0.8 1.1 May 2016.................................... 0.4 0.4 0.7 1.0 June 2016................................... 0.3 0.3 0.7 1.0 July 2016....................................-0.2 -0.2 0.5 0.8 August 2016................................. 0.0 0.1 0.7 1.1 September 2016............................ 0.2 0.2 1.1 1.5 October 2016............................... 0.2 0.1 1.3 1.6 November 2016.............................-0.2 -0.2 1.4 1.7 December 2016............................. 0.0 0.0 1.8 2.1 January 2017............................... 0.6 0.6 2.3 2.5 February 2017.............................. 0.3 0.3 2.6 2.7 March 2017.................................. 0.0 0.1 2.1 2.4 April 2017.................................... 0.3 0.3 1.8 2.2 May 2017.................................... 0.1 0.1 1.5 1.9 June 2017................................... 0.0 0.1 1.2 1.6 July 2017....................................-0.2 -0.1 1.3 1.7 August 2017................................. 0.3 0.3 1.5 1.9 September 2017............................ 0.5 0.5 1.9 2.2 October 2017...............................-0.1 -0.1 1.6 2.0 November 2017............................. 0.0 0.0 1.8 2.2 December 2017.............................-0.1 -0.1 1.7 2.1 January 2018............................... 0.5 0.5 1.6 2.1 February 2018.............................. 0.4 0.5 1.8 2.2 March 2018.................................. 0.2 0.2 2.0 2.4 April 2018.................................... 0.4 0.4 2.1 2.5 May 2018.................................... 0.4 0.4 2.4 2.8 June 2018................................... 0.1 0.2 2.5 2.9 July 2018.................................... 0.0 r 0.0 2.7 r 2.9 August 2018................................. 0.0 r 0.1 2.5 2.7 1 The C-CPI-U is designed to be a closer approximation to a cost-of-living index in that it, in its final form, accounts for any substitution that consumers make across item categories in response to changes in relative prices. Since the expenditure data required for the calculation of the C-CPI-U are available only with a time lag, the C-CPI-U is being issued first in preliminary form using the latest available expenditure data at that time and is subject to two revisions. r Revised NOTE: Revised index for C-CPI-U: Jul. 2018=142.520. Associated calculations, including percent change, may also have changed. Indexes are issued as initial estimates. Indexes are revised each quarter with the publication of January, April, July, and October data as updated expenditure estimates become available. The C-CPI-U indexes are updated quarterly until they become final. January-March indexes are final in January of the following year; April-June indexes are final in April of the following year; July-September indexes are final in July of the following year; October-December indexes are final in October of the following year.