-70.12% is the change from 666 to 199
Calculation steps:
[( 199 - 666 ) ÷ 666] x 100 = -70.12%
Formula
Percentage change = [(199 - 666) / 666] x 100
Subtract the new number by the original number
199 - 666 = -467
-467 ÷ 666 = -0.7012012012012012
-0.7012012012012012 x 100 = -70.12%