-83.99% is the change from 637 to 102
Calculation steps:
[( 102 - 637 ) ÷ 637] x 100 = -83.99%
Formula
Percentage change = [(102 - 637) / 637] x 100
Subtract the new number by the original number
102 - 637 = -535
-535 ÷ 637 = -0.8398744113029827
-0.8398744113029827 x 100 = -83.99%