-93.69% is the change from 634 to 40
Calculation steps:
[( 40 - 634 ) ÷ 634] x 100 = -93.69%
Formula
Percentage change = [(40 - 634) / 634] x 100
Subtract the new number by the original number
40 - 634 = -594
-594 ÷ 634 = -0.9369085173501577
-0.9369085173501577 x 100 = -93.69%