-64.56% is the change from 666 to 236
Calculation steps:
[( 236 - 666 ) ÷ 666] x 100 = -64.56%
Formula
Percentage change = [(236 - 666) / 666] x 100
Subtract the new number by the original number
236 - 666 = -430
-430 ÷ 666 = -0.6456456456456456
-0.6456456456456456 x 100 = -64.56%