-35.1% is the change from 510 to 331
Calculation steps:
[( 331 - 510 ) ÷ 510] x 100 = -35.1%
Formula
Percentage change = [(331 - 510) / 510] x 100
Subtract the new number by the original number
331 - 510 = -179
-179 ÷ 510 = -0.3509803921568627
-0.3509803921568627 x 100 = -35.1%