From the annals of the classless society:

The 400 wealthiest taxpayers accounted for more than 1 percent of all the income in the United States in the year 2000, more than double their share just eight years earlier, according to new data from the Internal Revenue Service. But their tax burden plummeted over the period.

Note that this is under Clinton -- and one of the biggest factors in the increase was a cut in the capital gains tax rate which Clinton signed into law.