| E-reader | Tablet computer | Desktop/laptop computer | |
|---|---|---|---|
| 1/13/2008 | 74% | ||
| 4/19/2009 | 2% | ||
| 9/14/2009 | 3% | ||
| 5/30/2010 | 4% | 3% | |
| 6/20/2010 | 78% | ||
| 9/13/2010 | 5% | 4% | |
| 11/24/2010 | 6% | 5% | |
| 5/22/2011 | 12% | 8% | |
| 8/26/2011 | 9% | 10% | |
| 12/21/2011 | 10% | 10% | 75% |
| 1/8/2012 | 18% | 20% | |
| 1/15/2012 | 19% | 19% | 78% |
| 2/19/2012 | 14% | 14% | |
| 4/3/2012 | 18% | 18% | |
| 8/5/2012 | 19% | 21% | |
| 8/7/2012 | 25% | ||
| 11/10/2012 | 19% | 24% | 77% |
| 12/16/2012 | 29% | ||
| 1/6/2013 | 26% | 31% | |
| 5/19/2013 | 24% | 34% | |
| 9/30/2013 | 24% | 34% | |
| 4/12/2015 | 19% | 45% | 73% |
| 4/4/2016 | 17% | 48% | 74% |
| 11/6/2016 | 22% | 51% | 78% |
| 1/10/2018 | 53% | 73% | |
| 2/7/2019 | 52% | 74% | |
| 2/8/2021 | 53% | 77% |
- Report
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