-68.71% is the change from 521 to 163
Calculation steps:
[( 163 - 521 ) ÷ 521] x 100 = -68.71%
Formula
Percentage change = [(163 - 521) / 521] x 100
Subtract the new number by the original number
163 - 521 = -358
-358 ÷ 521 = -0.6871401151631478
-0.6871401151631478 x 100 = -68.71%