-15.88% is the change from 510 to 429
Calculation steps:
[( 429 - 510 ) ÷ 510] x 100 = -15.88%
Formula
Percentage change = [(429 - 510) / 510] x 100
Subtract the new number by the original number
429 - 510 = -81
-81 ÷ 510 = -0.1588235294117647
-0.1588235294117647 x 100 = -15.88%