-3.05% is the change from 525 to 509
Calculation steps:
[( 509 - 525 ) ÷ 525] x 100 = -3.05%
Formula
Percentage change = [(509 - 525) / 525] x 100
Subtract the new number by the original number
509 - 525 = -16
-16 ÷ 525 = -0.030476190476190476
-0.030476190476190476 x 100 = -3.05%