-27.54% is the change from 915 to 663
Calculation steps:
[( 663 - 915 ) ÷ 915] x 100 = -27.54%
Formula
Percentage change = [(663 - 915) / 915] x 100
Subtract the new number by the original number
663 - 915 = -252
-252 ÷ 915 = -0.2754098360655738
-0.2754098360655738 x 100 = -27.54%