-75.59% is the change from 680 to 166
Calculation steps:
[( 166 - 680 ) ÷ 680] x 100 = -75.59%
Formula
Percentage change = [(166 - 680) / 680] x 100
Subtract the new number by the original number
166 - 680 = -514
-514 ÷ 680 = -0.7558823529411764
-0.7558823529411764 x 100 = -75.59%