-27.11% is the change from 911 to 664
Calculation steps:
[( 664 - 911 ) ÷ 911] x 100 = -27.11%
Formula
Percentage change = [(664 - 911) / 911] x 100
Subtract the new number by the original number
664 - 911 = -247
-247 ÷ 911 = -0.2711306256860593
-0.2711306256860593 x 100 = -27.11%