Wish that article had broken it up as:
Top 1%
Next 9% (not include the top 1% in this group)
Next 10% (they completely disregarded the 80% to 89.9% group)
The rest of the groupings are just fine.
I'd much rather compare myself to my own cohort without the distorting effects of including the top 1%. (yeah, yeah, comparison is the thief of joy, but I still like to have something to measure against).