-69.67% is the change from 521 to 158
Calculation steps:
[( 158 - 521 ) ÷ 521] x 100 = -69.67%
Formula
Percentage change = [(158 - 521) / 521] x 100
Subtract the new number by the original number
158 - 521 = -363
-363 ÷ 521 = -0.6967370441458733
-0.6967370441458733 x 100 = -69.67%