| Characteristic | Number of participants in millions |
|---|---|
| 2017 | 3.53 |
| 2016 | 3.58 |
| 2015 | 3.88 |
| 2014 | 3.59 |
| 2013 | 3.82 |
| 2012 | 4.06 |
| 2011 | 4.08 |
| 2010 | 4.63 |
| 2009 | 4.58 |
| 2008 | 4.99 |
| 2007 | 4.23 |
| 2006 | 3.56 |
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Source
Source
Release date
July 2018
More information
Region
United States
Survey time period
2006 to 2017
Number of respondents
30,999 respondents
Age group
6 years and older
Method of interview
Online survey
Supplementary notes
* A weighting technique was used to balance the data to reflect the total U.S. population ages six and above.
A participant was defined as an individual who took part in the activity at least once in the given year.
Data for 2009 was collected in January and February 2010 (Data for 2010 in January / February 2011). 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 2017 were taken from previous reports.
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