the two most important years are missing. 2012 and 2013
Look at that dip on the second chart. The line crashes as soon as Obama announced his run for the presidency.
The link to information on “natural log” charts is quite interesting.
I haven’t used them since college, almost 50 years ago, and I forgot how useful they can be.
Speaking of useful, it is always best to supply inflation adjusted charts, which, unfortunately, the author has not done.
One final thought:
It took the IRS almost 2 full years to release data from 2011.
Historically, that is interesting, but not very helpful to those of us who want current information.
I have to believe that good estimates for 2012 and 2013 could be obtained in a couple hours using off the shelf commercial software.
One problem may be access to IRS data.
Having open access actually requires a background check and a security clearance, but I can’t recall which level.