-23.83% is the change from 684 to 521
Calculation steps:
[( 521 - 684 ) ÷ 684] x 100 = -23.83%
Formula
Percentage change = [(521 - 684) / 684] x 100
Subtract the new number by the original number
521 - 684 = -163
-163 ÷ 684 = -0.23830409356725146
-0.23830409356725146 x 100 = -23.83%