-70.42% is the change from 666 to 197
Calculation steps:
[( 197 - 666 ) ÷ 666] x 100 = -70.42%
Formula
Percentage change = [(197 - 666) / 666] x 100
Subtract the new number by the original number
197 - 666 = -469
-469 ÷ 666 = -0.7042042042042042
-0.7042042042042042 x 100 = -70.42%