-95.29% is the change from 637 to 30
Calculation steps:
[( 30 - 637 ) ÷ 637] x 100 = -95.29%
Formula
Percentage change = [(30 - 637) / 637] x 100
Subtract the new number by the original number
30 - 637 = -607
-607 ÷ 637 = -0.9529042386185244
-0.9529042386185244 x 100 = -95.29%