-86.11% is the change from 511 to 71
Calculation steps:
[( 71 - 511 ) ÷ 511] x 100 = -86.11%
Formula
Percentage change = [(71 - 511) / 511] x 100
Subtract the new number by the original number
71 - 511 = -440
-440 ÷ 511 = -0.8610567514677103
-0.8610567514677103 x 100 = -86.11%