-84.34% is the change from 511 to 80
Calculation steps:
[( 80 - 511 ) ÷ 511] x 100 = -84.34%
Formula
Percentage change = [(80 - 511) / 511] x 100
Subtract the new number by the original number
80 - 511 = -431
-431 ÷ 511 = -0.8434442270058709
-0.8434442270058709 x 100 = -84.34%