-30.82% is the change from 915 to 633
Calculation steps:
[( 633 - 915 ) ÷ 915] x 100 = -30.82%
Formula
Percentage change = [(633 - 915) / 915] x 100
Subtract the new number by the original number
633 - 915 = -282
-282 ÷ 915 = -0.3081967213114754
-0.3081967213114754 x 100 = -30.82%