
| Frequency of usage | 2005 | 2006 | 2007 | 2009 |
|---|---|---|---|---|
| - | - | - | - | - |
| - | - | - | - | - |
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Source
Release date
May 2009
Region
United States
Survey time period
26 March to 29 April 2009
Number of respondents
2,253 respondents
Age group
18 years and older
Method of interview
Telephone interview
Supplementary notes
The source did not provide data for 2008.
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