I don't expect you to believe me, but the latest statistics I can find is for 2008.
In 2008 the top 10% made pretty close to 50% of the total income earned in the country. The top 10%'s tax burden was about 55% of total federal revenue.
I can dig it all out and present it to you, but I promise all them numbers are going to make your head hurt.
When folks throw numbers like the ones in your article around they don't want to talk about stuff like that, it doesn't help their case.