-29.64% is the change from 911 to 641
Calculation steps:
[( 641 - 911 ) ÷ 911] x 100 = -29.64%
Formula
Percentage change = [(641 - 911) / 911] x 100
Subtract the new number by the original number
641 - 911 = -270
-270 ÷ 911 = -0.29637760702524696
-0.29637760702524696 x 100 = -29.64%