-31.94% is the change from 911 to 620
Calculation steps:
[( 620 - 911 ) ÷ 911] x 100 = -31.94%
Formula
Percentage change = [(620 - 911) / 911] x 100
Subtract the new number by the original number
620 - 911 = -291
-291 ÷ 911 = -0.3194291986827662
-0.3194291986827662 x 100 = -31.94%