-67.66% is the change from 668 to 216
Calculation steps:
[( 216 - 668 ) ÷ 668] x 100 = -67.66%
Formula
Percentage change = [(216 - 668) / 668] x 100
Subtract the new number by the original number
216 - 668 = -452
-452 ÷ 668 = -0.6766467065868264
-0.6766467065868264 x 100 = -67.66%