How to set direction of added pie pieces to counter-clockwise

For my pie chart, I see that I can set startAngle, but I don't see where I can set the direction of the pie pieces. I would like pie pieces to be added counter-clockwise. Currently, they are added clockwise.

FYI, I am also setting a sort on the data, so the largest is always first. Right now the largest is taking the 12-3pm pie piece, the second largest taking 3-5pm, etc. I want them to go 12-9pm, 9-7pm.

Thanks,

--Ed