-85.71% is the change from 511 to 73
Calculation steps:
[( 73 - 511 ) ÷ 511] x 100 = -85.71%
Formula
Percentage change = [(73 - 511) / 511] x 100
Subtract the new number by the original number
73 - 511 = -438
-438 ÷ 511 = -0.8571428571428571
-0.8571428571428571 x 100 = -85.71%