-33.72% is the change from 771 to 511
Calculation steps:
[( 511 - 771 ) ÷ 771] x 100 = -33.72%
Formula
Percentage change = [(511 - 771) / 771] x 100
Subtract the new number by the original number
511 - 771 = -260
-260 ÷ 771 = -0.33722438391699094
-0.33722438391699094 x 100 = -33.72%