-37.77% is the change from 511 to 318
Calculation steps:
[( 318 - 511 ) ÷ 511] x 100 = -37.77%
Formula
Percentage change = [(318 - 511) / 511] x 100
Subtract the new number by the original number
318 - 511 = -193
-193 ÷ 511 = -0.3776908023483366
-0.3776908023483366 x 100 = -37.77%