-32.43% is the change from 771 to 521
Calculation steps:
[( 521 - 771 ) ÷ 771] x 100 = -32.43%
Formula
Percentage change = [(521 - 771) / 771] x 100
Subtract the new number by the original number
521 - 771 = -250
-250 ÷ 771 = -0.324254215304799
-0.324254215304799 x 100 = -32.43%