This article https://www.forbes.com/sites/patrickgleason/2018/07/06/millionaires-flee-california-after-tax-hike/ https://www.forbes.com/sites/patrickgleason/201

This article https://www.forbes.com/sites/patrickgleason/2018/07/06/millionaires-flee-california-after-tax-hike/ https://www.forbes.com/sites/patrickgleason/2018/07/06/milli... connects most of the emigration to Prop 30 and Prop 55, but it's kinda hard to take it at the face value with "an estimated 138 high-income individuals" and no context on total number of high-income individuals or the tax bill they would've responsible for had they stayed.