-15.7% is the change from 911 to 768
Calculation steps:
[( 768 - 911 ) ÷ 911] x 100 = -15.7%
Formula
Percentage change = [(768 - 911) / 911] x 100
Subtract the new number by the original number
768 - 911 = -143
-143 ÷ 911 = -0.15697036223929747
-0.15697036223929747 x 100 = -15.7%