-16.22% is the change from 820 to 687
Calculation steps:
[( 687 - 820 ) ÷ 820] x 100 = -16.22%
Formula
Percentage change = [(687 - 820) / 820] x 100
Subtract the new number by the original number
687 - 820 = -133
-133 ÷ 820 = -0.16219512195121952
-0.16219512195121952 x 100 = -16.22%