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%