-84.53% is the change from 666 to 103
Calculation steps:
[( 103 - 666 ) ÷ 666] x 100 = -84.53%
Formula
Percentage change = [(103 - 666) / 666] x 100
Subtract the new number by the original number
103 - 666 = -563
-563 ÷ 666 = -0.8453453453453453
-0.8453453453453453 x 100 = -84.53%