-96.88% is the change from 672 to 21
Calculation steps:
[( 21 - 672 ) ÷ 672] x 100 = -96.88%
Formula
Percentage change = [(21 - 672) / 672] x 100
Subtract the new number by the original number
21 - 672 = -651
-651 ÷ 672 = -0.96875
-0.96875 x 100 = -96.88%