-16.46% is the change from 820 to 685
Calculation steps:
[( 685 - 820 ) ÷ 820] x 100 = -16.46%
Formula
Percentage change = [(685 - 820) / 820] x 100
Subtract the new number by the original number
685 - 820 = -135
-135 ÷ 820 = -0.16463414634146342
-0.16463414634146342 x 100 = -16.46%