-99.37% is the change from 637 to 4
Calculation steps:
[( 4 - 637 ) ÷ 637] x 100 = -99.37%
Formula
Percentage change = [(4 - 637) / 637] x 100
Subtract the new number by the original number
4 - 637 = -633
-633 ÷ 637 = -0.9937205651491365
-0.9937205651491365 x 100 = -99.37%