-12.9% is the change from 597 to 520
Calculation steps:
[( 520 - 597 ) ÷ 597] x 100 = -12.9%
Formula
Percentage change = [(520 - 597) / 597] x 100
Subtract the new number by the original number
520 - 597 = -77
-77 ÷ 597 = -0.12897822445561138
-0.12897822445561138 x 100 = -12.9%