-15.6% is the change from 910 to 768
Calculation steps:
[( 768 - 910 ) ÷ 910] x 100 = -15.6%
Formula
Percentage change = [(768 - 910) / 910] x 100
Subtract the new number by the original number
768 - 910 = -142
-142 ÷ 910 = -0.15604395604395604
-0.15604395604395604 x 100 = -15.6%