-97.05% is the change from 677 to 20
Calculation steps:
[( 20 - 677 ) ÷ 677] x 100 = -97.05%
Formula
Percentage change = [(20 - 677) / 677] x 100
Subtract the new number by the original number
20 - 677 = -657
-657 ÷ 677 = -0.9704579025110783
-0.9704579025110783 x 100 = -97.05%