http://www.rebootillinois.com/2015/02/20/editors-picks/kevin-hoffmanrebootillinois-com/number-millionaires-illinois-declining/33433/

Comment: Love them or hate them, we need them here and paying taxes. That’s especially so for multimillionaires — those earning $1M per year — who some want to tax at higher rates. As we’ve written repeatedly, anecdotal evidences says they are changing residence to different states rapidly, but the state won’t collect and report that data.