-33.59% is the change from 515 to 342
Calculation steps:
[( 342 - 515 ) ÷ 515] x 100 = -33.59%
Formula
Percentage change = [(342 - 515) / 515] x 100
Subtract the new number by the original number
342 - 515 = -173
-173 ÷ 515 = -0.3359223300970874
-0.3359223300970874 x 100 = -33.59%