-71.9% is the change from 911 to 256
Calculation steps:
[( 256 - 911 ) ÷ 911] x 100 = -71.9%
Formula
Percentage change = [(256 - 911) / 911] x 100
Subtract the new number by the original number
256 - 911 = -655
-655 ÷ 911 = -0.7189901207464325
-0.7189901207464325 x 100 = -71.9%