-66.62% is the change from 767 to 256
Calculation steps:
[( 256 - 767 ) ÷ 767] x 100 = -66.62%
Formula
Percentage change = [(256 - 767) / 767] x 100
Subtract the new number by the original number
256 - 767 = -511
-511 ÷ 767 = -0.666232073011734
-0.666232073011734 x 100 = -66.62%