-86.64% is the change from 509 to 68
Calculation steps:
[( 68 - 509 ) ÷ 509] x 100 = -86.64%
Formula
Percentage change = [(68 - 509) / 509] x 100
Subtract the new number by the original number
68 - 509 = -441
-441 ÷ 509 = -0.8664047151277013
-0.8664047151277013 x 100 = -86.64%