-70.21% is the change from 668 to 199
Calculation steps:
[( 199 - 668 ) ÷ 668] x 100 = -70.21%
Formula
Percentage change = [(199 - 668) / 668] x 100
Subtract the new number by the original number
199 - 668 = -469
-469 ÷ 668 = -0.7020958083832335
-0.7020958083832335 x 100 = -70.21%