-80.53% is the change from 637 to 124
Calculation steps:
[( 124 - 637 ) ÷ 637] x 100 = -80.53%
Formula
Percentage change = [(124 - 637) / 637] x 100
Subtract the new number by the original number
124 - 637 = -513
-513 ÷ 637 = -0.8053375196232339
-0.8053375196232339 x 100 = -80.53%