-24.27% is the change from 688 to 521
Calculation steps:
[( 521 - 688 ) ÷ 688] x 100 = -24.27%
Formula
Percentage change = [(521 - 688) / 688] x 100
Subtract the new number by the original number
521 - 688 = -167
-167 ÷ 688 = -0.24273255813953487
-0.24273255813953487 x 100 = -24.27%