-31.18% is the change from 927 to 638
Calculation steps:
[( 638 - 927 ) ÷ 927] x 100 = -31.18%
Formula
Percentage change = [(638 - 927) / 927] x 100
Subtract the new number by the original number
638 - 927 = -289
-289 ÷ 927 = -0.3117583603020496
-0.3117583603020496 x 100 = -31.18%