-17.54% is the change from 821 to 677
Calculation steps:
[( 677 - 821 ) ÷ 821] x 100 = -17.54%
Formula
Percentage change = [(677 - 821) / 821] x 100
Subtract the new number by the original number
677 - 821 = -144
-144 ÷ 821 = -0.1753958587088916
-0.1753958587088916 x 100 = -17.54%