-41.4% is the change from 855 to 501
Calculation steps:
[( 501 - 855 ) ÷ 855] x 100 = -41.4%
Formula
Percentage change = [(501 - 855) / 855] x 100
Subtract the new number by the original number
501 - 855 = -354
-354 ÷ 855 = -0.41403508771929826
-0.41403508771929826 x 100 = -41.4%