-40.31% is the change from 851 to 508
Calculation steps:
[( 508 - 851 ) ÷ 851] x 100 = -40.31%
Formula
Percentage change = [(508 - 851) / 851] x 100
Subtract the new number by the original number
508 - 851 = -343
-343 ÷ 851 = -0.40305522914218567
-0.40305522914218567 x 100 = -40.31%