-25.51% is the change from 686 to 511
Calculation steps:
[( 511 - 686 ) ÷ 686] x 100 = -25.51%
Formula
Percentage change = [(511 - 686) / 686] x 100
Subtract the new number by the original number
511 - 686 = -175
-175 ÷ 686 = -0.25510204081632654
-0.25510204081632654 x 100 = -25.51%