-75.04% is the change from 685 to 171
Calculation steps:
[( 171 - 685 ) ÷ 685] x 100 = -75.04%
Formula
Percentage change = [(171 - 685) / 685] x 100
Subtract the new number by the original number
171 - 685 = -514
-514 ÷ 685 = -0.7503649635036497
-0.7503649635036497 x 100 = -75.04%