-85.04% is the change from 421 to 63
Calculation steps:
[( 63 - 421 ) ÷ 421] x 100 = -85.04%
Formula
Percentage change = [(63 - 421) / 421] x 100
Subtract the new number by the original number
63 - 421 = -358
-358 ÷ 421 = -0.850356294536817
-0.850356294536817 x 100 = -85.04%