-31.51% is the change from 511 to 350
Calculation steps:
[( 350 - 511 ) ÷ 511] x 100 = -31.51%
Formula
Percentage change = [(350 - 511) / 511] x 100
Subtract the new number by the original number
350 - 511 = -161
-161 ÷ 511 = -0.3150684931506849
-0.3150684931506849 x 100 = -31.51%