-31.18% is the change from 510 to 351
Calculation steps:
[( 351 - 510 ) ÷ 510] x 100 = -31.18%
Formula
Percentage change = [(351 - 510) / 510] x 100
Subtract the new number by the original number
351 - 510 = -159
-159 ÷ 510 = -0.31176470588235294
-0.31176470588235294 x 100 = -31.18%