-55.54% is the change from 911 to 405
Calculation steps:
[( 405 - 911 ) ÷ 911] x 100 = -55.54%
Formula
Percentage change = [(405 - 911) / 911] x 100
Subtract the new number by the original number
405 - 911 = -506
-506 ÷ 911 = -0.5554335894621295
-0.5554335894621295 x 100 = -55.54%