-74.85% is the change from 680 to 171
Calculation steps:
[( 171 - 680 ) ÷ 680] x 100 = -74.85%
Formula
Percentage change = [(171 - 680) / 680] x 100
Subtract the new number by the original number
171 - 680 = -509
-509 ÷ 680 = -0.7485294117647059
-0.7485294117647059 x 100 = -74.85%