-13.6% is the change from 603 to 521
Calculation steps:
[( 521 - 603 ) ÷ 603] x 100 = -13.6%
Formula
Percentage change = [(521 - 603) / 603] x 100
Subtract the new number by the original number
521 - 603 = -82
-82 ÷ 603 = -0.13598673300165837
-0.13598673300165837 x 100 = -13.6%