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

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, December 2021 [Percent changes]
Month Year	Unadjusted 1-month percent change		Unadjusted 12-month percent change
Month Year	C-CPI-U(1)	CPI-U	C-CPI-U(1)	CPI-U
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
December 2016			1.8	2.1
December 2017			1.7	2.1
December 2018			1.5	1.9

January 2019	0.2	0.2	1.3	1.6
February 2019	0.4	0.4	1.3	1.5
March 2019	0.5	0.6	1.5	1.9
April 2019	0.4	0.5	1.6	2.0
May 2019	0.2	0.2	1.4	1.8
June 2019	0.0	0.0	1.3	1.6
July 2019	0.1	0.2	1.5	1.8
August 2019	0.0	0.0	1.5	1.7
September 2019	0.0	0.1	1.4	1.7
October 2019	0.1	0.2	1.4	1.8
November 2019	-0.1	-0.1	1.6	2.1
December 2019	-0.2	-0.1	1.8	2.3
January 2020	0.4	0.4	2.0	2.5
February 2020	0.3	0.3	1.8	2.3
March 2020	-0.2	-0.2	1.1	1.5
April 2020	-0.5	-0.7	0.2	0.3
May 2020	-0.1	0.0	-0.1	0.1
June 2020	0.6	0.5	0.4	0.6
July 2020	0.6	0.5	0.9	1.0
August 2020	0.4	0.3	1.3	1.3
September 2020	0.1	0.1	1.4	1.4
October 2020	0.0	0.0	1.2	1.2
November 2020	-0.1	-0.1	1.2	1.2
December 2020	0.1	0.1	1.5	1.4
January 2021	0.4	0.4	1.5	1.4
February 2021	0.6	0.5	1.8	1.7
March 2021	0.7	0.7	2.8	2.6
April 2021	0.8	0.8	4.2	4.2
May 2021	0.8	0.8	5.1	5.0
June 2021	0.9	0.9	5.4	5.4
July 2021	0.5	0.5	5.2	5.4
August 2021	0.2	0.2	5.0	5.3
September 2021	0.3	0.3	5.2	5.4
October 2021	0.8	0.8	6.1	6.2
November 2021	0.5	0.5	6.7	6.8
December 2021	0.3	0.3	6.9	7.0
Footnotes (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 issued first in preliminary form using the latest available expenditure data at that time and is subject to four revisions.
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.

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Last Modified Date: January 12, 2022