-82.13% is the change from 677 to 121
Calculation steps:
[( 121 - 677 ) ÷ 677] x 100 = -82.13%
Formula
Percentage change = [(121 - 677) / 677] x 100
Subtract the new number by the original number
121 - 677 = -556
-556 ÷ 677 = -0.8212703101920237
-0.8212703101920237 x 100 = -82.13%