-76.8% is the change from 668 to 155
Calculation steps:
[( 155 - 668 ) ÷ 668] x 100 = -76.8%
Formula
Percentage change = [(155 - 668) / 668] x 100
Subtract the new number by the original number
155 - 668 = -513
-513 ÷ 668 = -0.7679640718562875
-0.7679640718562875 x 100 = -76.8%