-86.5% is the change from 511 to 69
Calculation steps:
[( 69 - 511 ) ÷ 511] x 100 = -86.5%
Formula
Percentage change = [(69 - 511) / 511] x 100
Subtract the new number by the original number
69 - 511 = -442
-442 ÷ 511 = -0.8649706457925636
-0.8649706457925636 x 100 = -86.5%