-28.98% is the change from 911 to 647
Calculation steps:
[( 647 - 911 ) ÷ 911] x 100 = -28.98%
Formula
Percentage change = [(647 - 911) / 911] x 100
Subtract the new number by the original number
647 - 911 = -264
-264 ÷ 911 = -0.2897914379802415
-0.2897914379802415 x 100 = -28.98%