-16.57% is the change from 821 to 685
Calculation steps:
[( 685 - 821 ) ÷ 821] x 100 = -16.57%
Formula
Percentage change = [(685 - 821) / 821] x 100
Subtract the new number by the original number
685 - 821 = -136
-136 ÷ 821 = -0.1656516443361754
-0.1656516443361754 x 100 = -16.57%