-16.32% is the change from 821 to 687
Calculation steps:
[( 687 - 821 ) ÷ 821] x 100 = -16.32%
Formula
Percentage change = [(687 - 821) / 821] x 100
Subtract the new number by the original number
687 - 821 = -134
-134 ÷ 821 = -0.16321559074299635
-0.16321559074299635 x 100 = -16.32%