-82.89% is the change from 637 to 109
Calculation steps:
[( 109 - 637 ) ÷ 637] x 100 = -82.89%
Formula
Percentage change = [(109 - 637) / 637] x 100
Subtract the new number by the original number
109 - 637 = -528
-528 ÷ 637 = -0.8288854003139717
-0.8288854003139717 x 100 = -82.89%