-40.05% is the change from 854 to 512
Calculation steps:
[( 512 - 854 ) ÷ 854] x 100 = -40.05%
Formula
Percentage change = [(512 - 854) / 854] x 100
Subtract the new number by the original number
512 - 854 = -342
-342 ÷ 854 = -0.40046838407494145
-0.40046838407494145 x 100 = -40.05%