-51.1% is the change from 861 to 421
Calculation steps:
[( 421 - 861 ) ÷ 861] x 100 = -51.1%
Formula
Percentage change = [(421 - 861) / 861] x 100
Subtract the new number by the original number
421 - 861 = -440
-440 ÷ 861 = -0.5110336817653891
-0.5110336817653891 x 100 = -51.1%