| Characteristic | Number of participants in millions |
|---|---|
| 2013 | 34.55 |
| 2012 | 35.15 |
| 2011 | 34.28 |
| 2010 | 38.39 |
| 2009 | 43.01 |
| 2008 | 49.02 |
| 2007 | 51.09 |
| 2006 | 47.95 |
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Source
Source
Release date
October 2014
More information
Region
United States
Survey time period
January and February 2014
Number of respondents
19,240 (7,528 individual and 11,712 household interviews)
Age group
6 years and older
Method of interview
Online interview
Supplementary notes
* A weighting technique was used to balance the data to reflect the total U.S. population ages six and above.
A participant is defined as an individual who took part in the activity at least once in the given year.
Number of survey participants: 40,141 (2009) / 38,742 (2010) / 38,742 (2011) / 38,172 (2012); Information on survey dates for 2006 to 2008 were not given.
Numbers have been rounded to provide a better understanding of the statistic.
Figures prior to 2013 were taken from previous reports.
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