-66.03% is the change from 521 to 177
Calculation steps:
[( 177 - 521 ) ÷ 521] x 100 = -66.03%
Formula
Percentage change = [(177 - 521) / 521] x 100
Subtract the new number by the original number
177 - 521 = -344
-344 ÷ 521 = -0.6602687140115163
-0.6602687140115163 x 100 = -66.03%