-41.13% is the change from 851 to 501
Calculation steps:
[( 501 - 851 ) ÷ 851] x 100 = -41.13%
Formula
Percentage change = [(501 - 851) / 851] x 100
Subtract the new number by the original number
501 - 851 = -350
-350 ÷ 851 = -0.4112808460634548
-0.4112808460634548 x 100 = -41.13%