-24.05% is the change from 686 to 521
Calculation steps:
[( 521 - 686 ) ÷ 686] x 100 = -24.05%
Formula
Percentage change = [(521 - 686) / 686] x 100
Subtract the new number by the original number
521 - 686 = -165
-165 ÷ 686 = -0.24052478134110788
-0.24052478134110788 x 100 = -24.05%