-96.85% is the change from 634 to 20
Calculation steps:
[( 20 - 634 ) ÷ 634] x 100 = -96.85%
Formula
Percentage change = [(20 - 634) / 634] x 100
Subtract the new number by the original number
20 - 634 = -614
-614 ÷ 634 = -0.9684542586750788
-0.9684542586750788 x 100 = -96.85%