-43.18% is the change from 917 to 521
Calculation steps:
[( 521 - 917 ) ÷ 917] x 100 = -43.18%
Formula
Percentage change = [(521 - 917) / 917] x 100
Subtract the new number by the original number
521 - 917 = -396
-396 ÷ 917 = -0.4318429661941112
-0.4318429661941112 x 100 = -43.18%