-49.2% is the change from 817 to 415
Calculation steps:
[( 415 - 817 ) ÷ 817] x 100 = -49.2%
Formula
Percentage change = [(415 - 817) / 817] x 100
Subtract the new number by the original number
415 - 817 = -402
-402 ÷ 817 = -0.4920440636474908
-0.4920440636474908 x 100 = -49.2%