-97% is the change from 667 to 20
Calculation steps:
[( 20 - 667 ) ÷ 667] x 100 = -97%
Formula
Percentage change = [(20 - 667) / 667] x 100
Subtract the new number by the original number
20 - 667 = -647
-647 ÷ 667 = -0.9700149925037481
-0.9700149925037481 x 100 = -97%