-39.76% is the change from 913 to 550
Calculation steps:
[( 550 - 913 ) ÷ 913] x 100 = -39.76%
Formula
Percentage change = [(550 - 913) / 913] x 100
Subtract the new number by the original number
550 - 913 = -363
-363 ÷ 913 = -0.39759036144578314
-0.39759036144578314 x 100 = -39.76%