-3.4% is the change from 530 to 512
Calculation steps:
[( 512 - 530 ) ÷ 530] x 100 = -3.4%
Formula
Percentage change = [(512 - 530) / 530] x 100
Subtract the new number by the original number
512 - 530 = -18
-18 ÷ 530 = -0.033962264150943396
-0.033962264150943396 x 100 = -3.4%