-99.7% is the change from 677 to 2
Calculation steps:
[( 2 - 677 ) ÷ 677] x 100 = -99.7%
Formula
Percentage change = [(2 - 677) / 677] x 100
Subtract the new number by the original number
2 - 677 = -675
-675 ÷ 677 = -0.9970457902511078
-0.9970457902511078 x 100 = -99.7%