-48.09% is the change from 811 to 421
Calculation steps:
[( 421 - 811 ) ÷ 811] x 100 = -48.09%
Formula
Percentage change = [(421 - 811) / 811] x 100
Subtract the new number by the original number
421 - 811 = -390
-390 ÷ 811 = -0.4808877928483354
-0.4808877928483354 x 100 = -48.09%