-34.51% is the change from 510 to 334
Calculation steps:
[( 334 - 510 ) ÷ 510] x 100 = -34.51%
Formula
Percentage change = [(334 - 510) / 510] x 100
Subtract the new number by the original number
334 - 510 = -176
-176 ÷ 510 = -0.34509803921568627
-0.34509803921568627 x 100 = -34.51%