Creator of the graphs and author of the original post (here:
https://medium.com/mattermark-daily/why-is-the-number-of-see...)
All the quarters from Q1 2005 through Q4 2014 were plotted. The axis labels do not show all of them due to space constraints. Apologies that this was confusing, I will make sure to add all the tick marks and labels in the future.