-42.3% is the change from 851 to 491
Calculation steps:
[( 491 - 851 ) ÷ 851] x 100 = -42.3%
Formula
Percentage change = [(491 - 851) / 851] x 100
Subtract the new number by the original number
491 - 851 = -360
-360 ÷ 851 = -0.42303172737955347
-0.42303172737955347 x 100 = -42.3%