-70.06% is the change from 521 to 156
Calculation steps:
[( 156 - 521 ) ÷ 521] x 100 = -70.06%
Formula
Percentage change = [(156 - 521) / 521] x 100
Subtract the new number by the original number
156 - 521 = -365
-365 ÷ 521 = -0.7005758157389635
-0.7005758157389635 x 100 = -70.06%