-27.44% is the change from 911 to 661
Calculation steps:
[( 661 - 911 ) ÷ 911] x 100 = -27.44%
Formula
Percentage change = [(661 - 911) / 911] x 100
Subtract the new number by the original number
661 - 911 = -250
-250 ÷ 911 = -0.27442371020856204
-0.27442371020856204 x 100 = -27.44%