-66.8% is the change from 771 to 256
Calculation steps:
[( 256 - 771 ) ÷ 771] x 100 = -66.8%
Formula
Percentage change = [(256 - 771) / 771] x 100
Subtract the new number by the original number
256 - 771 = -515
-515 ÷ 771 = -0.6679636835278858
-0.6679636835278858 x 100 = -66.8%