-30.9% is the change from 754 to 521
Calculation steps:
[( 521 - 754 ) ÷ 754] x 100 = -30.9%
Formula
Percentage change = [(521 - 754) / 754] x 100
Subtract the new number by the original number
521 - 754 = -233
-233 ÷ 754 = -0.3090185676392573
-0.3090185676392573 x 100 = -30.9%