-64.87% is the change from 911 to 320
Calculation steps:
[( 320 - 911 ) ÷ 911] x 100 = -64.87%
Formula
Percentage change = [(320 - 911) / 911] x 100
Subtract the new number by the original number
320 - 911 = -591
-591 ÷ 911 = -0.6487376509330406
-0.6487376509330406 x 100 = -64.87%