-86.77% is the change from 499 to 66
Calculation steps:
[( 66 - 499 ) ÷ 499] x 100 = -86.77%
Formula
Percentage change = [(66 - 499) / 499] x 100
Subtract the new number by the original number
66 - 499 = -433
-433 ÷ 499 = -0.8677354709418837
-0.8677354709418837 x 100 = -86.77%