-85.53% is the change from 456 to 66
Calculation steps:
[( 66 - 456 ) ÷ 456] x 100 = -85.53%
Formula
Percentage change = [(66 - 456) / 456] x 100
Subtract the new number by the original number
66 - 456 = -390
-390 ÷ 456 = -0.8552631578947368
-0.8552631578947368 x 100 = -85.53%