-42.92% is the change from 911 to 520
Calculation steps:
[( 520 - 911 ) ÷ 911] x 100 = -42.92%
Formula
Percentage change = [(520 - 911) / 911] x 100
Subtract the new number by the original number
520 - 911 = -391
-391 ÷ 911 = -0.429198682766191
-0.429198682766191 x 100 = -42.92%