-68.76% is the change from 637 to 199
Calculation steps:
[( 199 - 637 ) ÷ 637] x 100 = -68.76%
Formula
Percentage change = [(199 - 637) / 637] x 100
Subtract the new number by the original number
199 - 637 = -438
-438 ÷ 637 = -0.6875981161695447
-0.6875981161695447 x 100 = -68.76%