-68.33% is the change from 521 to 165
Calculation steps:
[( 165 - 521 ) ÷ 521] x 100 = -68.33%
Formula
Percentage change = [(165 - 521) / 521] x 100
Subtract the new number by the original number
165 - 521 = -356
-356 ÷ 521 = -0.6833013435700576
-0.6833013435700576 x 100 = -68.33%