-53.79% is the change from 911 to 421
Calculation steps:
[( 421 - 911 ) ÷ 911] x 100 = -53.79%
Formula
Percentage change = [(421 - 911) / 911] x 100
Subtract the new number by the original number
421 - 911 = -490
-490 ÷ 911 = -0.5378704720087816
-0.5378704720087816 x 100 = -53.79%