-29.13% is the change from 913 to 647
Calculation steps:
[( 647 - 913 ) ÷ 913] x 100 = -29.13%
Formula
Percentage change = [(647 - 913) / 913] x 100
Subtract the new number by the original number
647 - 913 = -266
-266 ÷ 913 = -0.2913472070098576
-0.2913472070098576 x 100 = -29.13%