| Characteristic | Number of users in millions |
|---|---|
| 2017 | 32.28 |
| 2016 | 32.22 |
| 2015 | 32.32 |
| 2014 | 31.83 |
| 2013 | 30.41 |
| 2012 | 28.56 |
| 2011 | 29.73 |
| 2010 | 27.32 |
| 2009 | 25.9 |
| 2008 | 24.44 |
| 2007 | 23.59 |
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Source
Source
Release date
July 2018
More information
Region
United States
Survey time period
2007 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 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) / 38,172 (2011) / 42,363 (2012) / 19,240 (2013) / 10,778 (2014) / 32,658 (2015) / 24,134 (2016); Information on survey dates for 2007 to 2008 were not given.
Figures prior to 2017 were taken from previous surveys.
Numbers have been rounded to provide a better understanding of the statistic.
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