-67.57% is the change from 666 to 216
Calculation steps:
[( 216 - 666 ) ÷ 666] x 100 = -67.57%
Formula
Percentage change = [(216 - 666) / 666] x 100
Subtract the new number by the original number
216 - 666 = -450
-450 ÷ 666 = -0.6756756756756757
-0.6756756756756757 x 100 = -67.57%