-38.94% is the change from 511 to 312
Calculation steps:
[( 312 - 511 ) ÷ 511] x 100 = -38.94%
Formula
Percentage change = [(312 - 511) / 511] x 100
Subtract the new number by the original number
312 - 511 = -199
-199 ÷ 511 = -0.38943248532289626
-0.38943248532289626 x 100 = -38.94%