-1.7% is the change from 529 to 520
Calculation steps:
[( 520 - 529 ) ÷ 529] x 100 = -1.7%
Formula
Percentage change = [(520 - 529) / 529] x 100
Subtract the new number by the original number
520 - 529 = -9
-9 ÷ 529 = -0.017013232514177693
-0.017013232514177693 x 100 = -1.7%