-42.94% is the change from 913 to 521
Calculation steps:
[( 521 - 913 ) ÷ 913] x 100 = -42.94%
Formula
Percentage change = [(521 - 913) / 913] x 100
Subtract the new number by the original number
521 - 913 = -392
-392 ÷ 913 = -0.4293537787513691
-0.4293537787513691 x 100 = -42.94%