-51.11% is the change from 859 to 420
Calculation steps:
[( 420 - 859 ) ÷ 859] x 100 = -51.11%
Formula
Percentage change = [(420 - 859) / 859] x 100
Subtract the new number by the original number
420 - 859 = -439
-439 ÷ 859 = -0.5110593713620489
-0.5110593713620489 x 100 = -51.11%