-53.11% is the change from 851 to 399
Calculation steps:
[( 399 - 851 ) ÷ 851] x 100 = -53.11%
Formula
Percentage change = [(399 - 851) / 851] x 100
Subtract the new number by the original number
399 - 851 = -452
-452 ÷ 851 = -0.5311398354876615
-0.5311398354876615 x 100 = -53.11%