-39.78% is the change from 915 to 551
Calculation steps:
[( 551 - 915 ) ÷ 915] x 100 = -39.78%
Formula
Percentage change = [(551 - 915) / 915] x 100
Subtract the new number by the original number
551 - 915 = -364
-364 ÷ 915 = -0.3978142076502732
-0.3978142076502732 x 100 = -39.78%