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Source
Source
Release date
September 2014
More information
Region
United States
Survey time period
Spring 2008 to spring 2014
Number of respondents
approx. 207,000
Age group
18 years and older
Method of interview
Computer-assisted telephone interviews (CATI)
Supplementary notes
Base total population (18 years and older): spring 2014: 241.53 million
autumn 2013: 240.09 million
spring 2013: 238.56 million
autumn 2012: 237.02 million
spring 2012: 236.61 million
autumn 2011: 236.2 million
spring 2011: 235.02 million
autumn 2010: 233.84 million
spring 2010: 232.96 million
autumn 2009: 232.08 million
spring 2009: 230.98 million
autumn 2008: 229.87 million
spring 2008: 228.48 million
The data have been rounded to provide a better understanding of the statistics.
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