-52.14% is the change from 817 to 391
Calculation steps:
[( 391 - 817 ) ÷ 817] x 100 = -52.14%
Formula
Percentage change = [(391 - 817) / 817] x 100
Subtract the new number by the original number
391 - 817 = -426
-426 ÷ 817 = -0.5214198286413708
-0.5214198286413708 x 100 = -52.14%