-23.04% is the change from 677 to 521
Calculation steps:
[( 521 - 677 ) ÷ 677] x 100 = -23.04%
Formula
Percentage change = [(521 - 677) / 677] x 100
Subtract the new number by the original number
521 - 677 = -156
-156 ÷ 677 = -0.23042836041358936
-0.23042836041358936 x 100 = -23.04%
Example