-39.7% is the change from 854 to 515
Calculation steps:
[( 515 - 854 ) ÷ 854] x 100 = -39.7%
Formula
Percentage change = [(515 - 854) / 854] x 100
Subtract the new number by the original number
515 - 854 = -339
-339 ÷ 854 = -0.39695550351288056
-0.39695550351288056 x 100 = -39.7%