-15.66% is the change from 913 to 770
Calculation steps:
[( 770 - 913 ) ÷ 913] x 100 = -15.66%
Formula
Percentage change = [(770 - 913) / 913] x 100
Subtract the new number by the original number
770 - 913 = -143
-143 ÷ 913 = -0.1566265060240964
-0.1566265060240964 x 100 = -15.66%