-82.81% is the change from 634 to 109
Calculation steps:
[( 109 - 634 ) ÷ 634] x 100 = -82.81%
Formula
Percentage change = [(109 - 634) / 634] x 100
Subtract the new number by the original number
109 - 634 = -525
-525 ÷ 634 = -0.8280757097791798
-0.8280757097791798 x 100 = -82.81%